@ShavedThronel0 I DID say that this was MY list, and to not take it personally.
Let me explain my reasoning behind why Toxic Chomper is on my list over Chomp Thing.
First, you're wrong. Toxic Chomper deals 6 damage, Chomp Thing deals 7.5 AND gets a damage upgrade. Sure, you can say that the Toxic effect can result in more damage, but Chomp Thing's breath is more powerful.
Next, Toxic Chomper overheats faster than Chomp Thing. Toxic overheats after 3 seconds (4.5 seconds with overheat upgrade) of constant attacking, and Chomp Thing overheats after 4 seconds (5 seconds with overheat upgrade) of constant attacking.
Chomp Thing also recovers from an overheat faster than Toxic Chomper does. Chomp Thing recovers after 2 seconds, Toxic recovers after 2.5 seconds.
Sure, you can say that Chomp Thing has less health, but it's his faster regeneration that makes him so good. Chomp Thing (as with most Chompers) is best at taking Zombies that stray from the group, you're not going to do well trying to combat multiple enemies at once.
Your goal as Chomp Thing (as it should be with any other Chomper) is to be sneaky. You can pick off an unsuspecting target with ease, or single out one target with your goop. Should your health get low, you have many options. You can use burrow to make a retreat, you can stay still with burrow and restore your health, or simply try and run away for long enough so that your health goes back up.
Chomp Thing is by no means as useless or weak as some people make him out to be, but nevertheless, he still needs buffing all the same as Toxic.