I decided to handle both these figures at the same time since they are pretty much the same sculpt. As you can see the one on the left is a normal looking Hulk and the one on the right has robotic components.
The Robot Hulk figure was released first in 2011 in the Incredible Hulk set. The normal Hulk was later released in 2012 as part of the Galactic Guardians Set.
These probably represent the most detailed Green Hulk heroclix you will find with few exceptions. They have nicely sculpted muscles with a very basic paint job. The robotic parts seem more or less glued on extras which is why it’s odd the robot sculpt was released prior to the normal one. Their faces are kinda squished in there to handle so much detail.
The Robot Hulk is a common item while the normal Hulk is rated as ‘Rare’. Both are fairly cheap to buy ranging around $2-4 dollars.