Broccoli Guy - Too weak and yet very useful when it comes to healing Skylanders
Chompy - Very annoying
Chompy Mage - Almost as obnoxious as Kaos, only Chompy style
Cuckoo Clocker - Has the strongest primary attack, but requires uninterrupted charging
Sheep Creep - Second weakest Life Villain and way too easy to defeat
Shield Shredder - Nah
If I had to choose either one of the six, it would definitely be the Chompy Mage since he has at least four different abilities:
1) Staff Slam
2) Chompy Summoning
3) Monster Chompy Transformation
4) Shockwave (Monster Chompy form only)