The difference between Tineco A10 Hero,Tango,Spartan and Dash is as follows:

• Battery
  The Tineco A10 Dash has a built-in battery whereas the Hero,Tango and Spartan have a detachable battery. With removable battery design, you can buy a second battery to extend the run time.
• Motor
  The Tineco A10 Dash equipped with a 300W brushless motor whereas the Hero,Tango and Spartan have a 350W motor.
• Accessories
  The Dash comes with a Full-size LED Multi-tasker Power Brush,2-in-1 Dusting Brush,Crevice Tool and Wall Mount;
  the Hero comes with a Full-size LED Multi-tasker Power Brush,Mini Power Brush,2-in-1 Dusting Brush,Crevice Tool,Hair Cleaning Tool,Pre Filter Cleaning Tool and Wall Mount;
  the Tango comes with a a Full-size LED Multi-tasker Power Brush,Full-size LED Soft-roller Power Brush,Mini Power Brush,2-in-1 Dusting Brush,Crevice Tool,Hair Cleaning Tool,Pre Filter Cleaning Tool,Extra Pre Filter and Wall Mount;
  the Spartan comes with a Full-size LED Multi-tasker Power Brush,2-in-1 Dusting Brush,Crevice Tool,Hair Cleaning Tool and Wall Mount Dock.

  P.S.
  Included accessories may vary from time to time, for example, the A10 Hero used to come with a Powerhouse floor storage dock, but the new version now comes with a Wall Mount.
  Please always make sure what are included by contacting the seller if you care about attachments.

• Color
  The A10 Dash is Purple,
  the A10 Hero is Space Blue,
  the A10 Tango is Space Blue,
  the A10 Spartan main colors are grey and silver.

Otherwise, they are the same.

Similarities:

• Stick & Handheld 2-in-1 design for tackling different cleaning jobs.
• Powered by 2000mAh lithium ion battery.
• No brush On/Off control.
• They cannot stand upright.
• Run up to 25 minutes runtime in regular mode, up to 10 minutes runtime in MAX mode.
• Recharging takes approximately 3-4 hours.
• 4-stage fully-sealed filtration system with HEPA filter to emit fresh air.
• LED headlights to help find hidden dirt.
• Have trigger and continuous power options to fit different preferences. You can use the trigger type switch button or lock the switch button for continuous power mode.
• Easy empty dust cup allows you to empty the bin by only pressing one button.
• Bagless and the bin capacity is 400ml.
• Backed by 2-year limited warranty for whole units, 1 year limited warranty for battery.

Download Tineco A10 series cordless vacuum manual to learn more:
https://us.tineco.com/upload/support/1554255981599306214.pdf

These Tineco A11 series vacuums are almost the same except for some tiny difference.
If you are deciding between them, here is the difference between Tineco A11 Hero,Hero EX,Master Plus and Tango:

• Number of Battery Included
  The A11 Hero and Tango come with one battery whereas the A11 Hero EX and Master Plus come with two batteries.
• Battery
  The Tineco A11 Hero,Hero EX and Tango have single 2500mAh battery whereas the Master Plus has 2 2000mAh batteries.
• Power Modes
  The Tineco A11 Hero,Hero EX and Tango have 3 power Modes: I,II,Max; whereas the Master Plus has 2 Modes: Normal,Max.
• Running Time
  Since the A11 Hero EX and Master Plus include dual batteries, the extra battery extends the running time. The A11 Hero EX runs up to 80 minutes, the Master Plus has 2 2000m mAh batteries, runs up to 50 minutes, whereas the Tineco A11 Hero and Tango run up to 40 minutes.
• Attachments
  The Tineco A11 Hero and Hero EX come with (1)Full-size LED Multi-tasker Power Brush,(1)Mini Power Brush,(1)Pre Filter Cleaning Tool,(1)Hair Cleaning Tool,(1)2-in-1 Dusting Brush,(1)Additional Microfiber Pre Filter,(1)Crevice Tool,(1)Dual Charging Wall Mount and (1)Adapter.

  The A11 Tango comes with all the above accessories and (1)Full-size LED Soft-roller Power Brush.

  The A11 Master Plus comes with all accessories Tango includes, and (1)Flexible Crevice Tool.
  

  

  Tool screenshot from tineco.com

  
  P. S.
  The included attachments may vary from time to time. For example, the A11 Master Plus used to have a Soft Dusting Brush, a Multi-angle Folding Tube, and a Flexible Extension Hose. But now, these tools are not included.
  So please always make sure what are included by contacting the seller before placing an order.
• Color
  The A11 Master+ is in Emerald whereas the others are blue.

Tineco A11 Master vs A11 Master Plus
The difference between A11 Master and A11 Master Plus is the charging dock. The A11 Master comes with a Powerhouse floor charging dock while the A11 Master Plus comes with a wall-mounted charging dock.
Otherwise, they are the same.

Similarities:

• Stick & Handheld 2-in-1 design for tackling both floor and above floor cleaning jobs, also for cars and boats cleaning.
  Motorized brushroll with no brush On/Off control.
  Not self cleaning brush.
• They cannot stand by their own.
• User friendly detachable battery design allows you to easily swap batteries if you get an additional battery.
• Take approximately 3-4 hours to recharge.
• 4-stage fully-sealed filtration system with HEPA filter to capture small particles and expel clean air.
• LED headlights to help clean low light areas.
• Have trigger and continuous power options. You can choose to keep pressing the switch button to vacuum or lock the switch button for continuous power mode without holding down all the time.
• Bagless and the dust cup capacity is 600ml.

Read Comparison of Tineco A11 Hero,Hero EX,Master Plus,and Tango here, learn the difference between them and make an informed purchase.