The Bissell 2030 3-in-1 Lightweight Stick Vacuum, Bissell 2033 FeatherWeight Lightweight Stick Vacuum, and Bissell 2610 3-in-1 Turbo Stick Vacuum are multi purpose lightweight vacuum cleaners.
Without the floor nozzle and removable handle, they can be used as a handheld vacuum to do upholstery cleaning and other above floor cleaning; when connect the nozzle and handle to the hand unit, they can be used as a stick vacuum for floor cleaning; you can also use the handheld part with the nozzle attached to clean stairs.
They looks similar. If you are deciding between them, here is the difference between them that may help you make an informed decision.

• Floor Nozzle
  This is the main difference between them.
  All of them have a removable floor nozzle.
  However, the 2610 has a motorized brushroll. Its nozzle has a small motor inside that drives the roller.
  And it has a clear view cover that let’s you see the brushroll.
  Whereas the 2030 and 2033 have no rotating roller brush, only an opening at the center underneath the nozzle for suction. And there is no transparent view window on the nozzle.
• Accessories
  The 2033 come with a crevice tool for cleaning nooks and crannies whereas the 2030 and 2610 do not include this tool. However, it can be purchased separately.
• There is also a small design difference on the handle of the hand unit. But that’s not a big deal.

Otherwise, they are very similar.

• They are designed for quick pick up.
• They are 3-in-1: stick vacuum, handheld vacuum, and stair cleaner.
• They are lightweight, weigh less than 4 lbs.
• Powered by 2 amps motor.
• They have a 15-foot power cord.
• Have cord wrap for neat cord storage.
• Have On/Off switch on the hand unit.
• Use dust cup to collect messes.
• There is no suction control nor carpet pile adjustment.
• There is no hose.
• There is no cleaning wand.
• Cleaning path width is 9.5-inch.
• Do not have a swivel nozzle.
• Have washable filter which is HEPA.
• They do self stand.
• Handle do not fold up for storage.
• Carry one year limited warranty.

Download Manuals to learn more details:
Bissell 2030 series manual:
https://support.bissell.com/app/answers/list/p/67330/c/26115

Bissell 2033 series user guide:
https://support.bissell.com/app/answers/list/p/67331/c/26115

Bissell 2610 manual pdf:
https://support.bissell.com/app/answers/list/p/171841/c/26115

The difference between Bissell 3061 and 3079 featherweight cordless stick & handheld 2-in-1 vacuum are as follows:

• Battery
  The Bissell 3061 is powered by 10.8V lithium-ion battery, it runs up to 20 minutes.
  Whereas the Bissell 3079 equipped with 14.4V lithium-ion battery, it runs up to 25 minutes.
• Speed
  The 3061 has 1 speed whereas the 3079 has 2 speed options.
• Color
  The 3061 is blue while the 3079 is red.

Otherwise, they are the same.

Similarities between them:

• Cordless and bagless.
• Battery is not detachable, NOT the type that you can get an extra battery to extend the running time.
• Takes about 4.5 hours to fully charged.
• They are stick & handheld 2-in-1 vacuum. The built-in hand vacuum can be removed from the stick.
• Motorized brushroll allows you to turn on or off to clean both carpeted surfaces and hard floors.
• Fingertip control allows you to turn on/off the vacuum, or the brushroll without bending over.
• Handle can be folded down for storage, or folded inward to clean under furniture.
• Swivel head adds extra maneuverability, especially when cleaning around obstacles.
• Filter is washable.
• Can stand by their own.
• Comes with a upholstery tool and a crevice tool.
• Carry one year limited warranty.

The difference between Bissell Featherweight stick lightweight bagless vacuum cleaners 2033, 2033M, 20334 and 20336 are the color.
The 2033 is blue,
the 2033M is black,
the 20334 is purple,
while the 20336 is lime.

Otherwise, they are the same.
These lightweight vacuums are designed for every day quick pick up.

• You can use them as a floor vacuum,
  or a handheld vacuum for above floor cleaning such as upholstery cleaning,
  or attach the floor nozzle to hand unit to clean stairs and large surfaces.
• They are corded, have a 15-foot cord and a 2 amps motor.
• No auto cord rewind. You have to wind the cord manually.
• NOT trigger type power control. No need to keep holding down the button to power on.
• They are bagless, have a dust cup that holds up to 0.67L.
• There is no suction control to adjust the suction power.
• There is no carpet pile adjustment.
• There is no hose.
• There is no cleaning wand.
• Comes with a crevice tool for small jobs and a detachable floor nozzle for floor and stairs cleaning.
• Cleaning path width is 9.5-inch.
• No motorized brushroll, the floor nozzle has suction only.
• Nozzle head does not swivel.
• Filter is washable.
• There is no HEPA filter.
• They do not have locking mechanism to stand upright, they will need level floor to stand up by balance. May tip over, you’d better lean them against a wall or something else.
• Do not fold up for storage.
• Replacement filter part number: filter assembly 1611508 and pre-motor foam filter 1611500.
• Carry one year limited warranty.

Download Bissell Featherweight 2033 series manual to learn more:
https://support.bissell.com/app/answers/list/p/67331/c/26115

The Bissell 2897 Pet Hair Eraser Slim Corded Vacuum Cleaner and Bissell 3070 PowerGlide Pet Slim Corded Vacuum are very similar to each other.
The difference between them is the cord length, included tools and color scheme.

• The 2897 is an exclusive model to Walmart, it has a 27-foot cord whereas the 3070 has a longer power cord which is 30-foot long.
• The 2897 comes with a Crevice Tool and a Pet TurboEraser Tool whereas the 3070 comes with a Crevice Tool, a Pet TurboEraser Tool, and a Dusting Brush.
• The 2897 main color is green whereas the 3070 main color is grey and black.

Otherwise, they are similar:

• They are stick and handheld 2-in-1 vacuums.
• Tangle-Free Brush Roll reduces hair wrapping problems.
• Brush Roll ON/OFF control for multi-surface cleaning.
• Both have 2 modes: hard floor mode with brush off, carpet mode with spinning brush.
• Brushroll can be removed to clear debris. However, you will have to remove screws to remove the bottom cover first.
• Swivel head allows for easier maneuvering around corners and furniture legs.
• 10-inch cleaning path width.
• Bagless, dust cup holds 500ml.
• Easy Empty Dirt Tank and CleanSlide Technology make maintaining the vacuum easier.
• Washable filter, not HEPA filter.
• Come with Wall Mount and Tool Storage Station for storing the vacuum and accessories.
• 4.2 amps power rating.
• Carry 2 year limited warranty.