The difference between Bissell Iconpet,IconPet Edge and IconPet Pro are as follows:

• Battery
  The IconPet standard model features a 21.6V rechargeable lithium-ion battery pack whereas the IconPet Pro and IconPet Edge equipped with a 25.2V rechargeable lithium-ion battery pack. This is the main difference between these vacuum cleaners.
• Edge Cleaning
  According to Bissell, The IconPet Edge nozzle can do closer Edge to Edge Cleaning, does a much better job on edge and corner cleaning than the ICONpet 2288 and 2746 series.
• Included Tools
  The IconPet model 22889 and IconPet Edge come with (1)Lighted Crevice Tool & Dusting Brush Combination Tool, (1)Motorized TurboBrush Tool.
  While the Pro 2746A comes with (1)Flexible Crevice Tool, (1)Lighted Crevice Tool
  & Dusting Brush Combination Tool, (1)Motorized TurboBrush Tool, (1)Pet Dusting Brush.
  (The Pro also comes with an additional Hard Floor Brush Roll for cleaning hard floors. And it includes an additional holder to attach to the charging station to hold 2 extra tools.)
  
  

  image from Bissell infomercial

• Price
  The Pro version is approximately 50 dollars more expensive than the regular version, the Edge model priced between them.
• Warranty Period
  The IconPet and IconPet Edge carry 2 year limited warranty while the Pro carries 3 year limited warranty.
• Color
  The IconPet model 22889 is Titanium & Black with Electric Blue accents in color, the IconPet Edge is Black with Cobalt Blue and Silver Accents, while the IconPet Pro model 2746A is Titanium & Black with Copper Harbor & Pearl White accents.

Check Bissell ICONPet Pro Price at Amazon

Otherwise, they are the same.

Things you may want to know before buying:

• Is the brush roller motorized or air powered?
  It’s motorized.
• Do they stand up on their own?
  No.
• How many batteries do they come with?
  One.
• Can you buy a second battery and swap batteries for longer operating time?
  No. The battery pack cannot be removed by end user. If you remove the battery yourself, it will invalidate the warranty.
• Do they come with a charger?
  Yes.
• How can I charge the vacuum?
  You can plug the charger directly into the Hand Vacuum Assembly or into the Wall Mount.
• How long will it take to fully charged?
  Approximately 4 hours.
• How long will it run per charge?
  Depends on what cleaning modes you set and what attachments you use, it runs approximately 20 to 50 minutes.
• Do you need to keep pressing a button when vacuuming?
  No. Just press the power button once to turn it on.
• How many cleaning modes?
  There are 3 cleaning modes that provide different levels of suction power for vacuuming bare floor, area rugs, carpets.
• Is there a BrushRoll on/off control?
  No. The brushroll keeps rotating.
• Do they use HEPA filter?
  They have one pre-motor filter and one post-motor filter. Both are not HEPA.
• Do they come with a wall mount?
  Yes.

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Bissell IconPet/IconPet Edge/IconPet Pro specifications and features:

• Stick and handheld 2 in 1. Can be used as a stick vacuum or a hand vacuum.
• Cordless, powered by lithium-ion battery.
• Bagless, use dust cup to collect debris, 0.4 L cup capacity.
• Digital Motor spins at up to 420 miles per hour.
• Tangle-Free Brush Roll with specially engineered bristles and powerful suction ensures pet hair stays off the brush roll and goes straight into the tank without wrapping, roller spins up to 3200 RPM.
• CleanSlide Technology provides a mess-free empty.
• Smart Seal Allergen System helps trap find dust and allergens inside the vacuum.
• Swivel head for easy maneuvering.
• 10.5-inch cleaning path width.
• LED Headlights help illuminate dark spots and reveal dust and debris.
  
  

  image from Bissell infomercial

• Motorized TurboBrush Tool help remove pet hair.
• Wall Storage & Charging Station for charging and neat tools storage.
• Indicator lights to show you if there’s anything wrong with the airflow, battery, brushroll, or suction motor.

They use an internal battery which can not be replaced by users. As we know, a battery will die sooner or later. If the battery cannot hold a charge, the whole vacuum cleaner is useless. With a detachable battery, you can also handle longer cleaning jobs. Or you have to wait a few hours to continue vacuuming. So, it could be better to make the battery swappable.

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Read ICONPet/Pro Users Reviews at Amazon