Well they are both rather unlikely, but at least the lizard thing is testable. Poke the guy with a stick and see. Question answered. The other theories cannot be so easily disproved.
Practically speaking, you can't personally poke the guy with a stick, and you don't trust the people who claim they have poked him. That's the unresolvable problem in the debate, same as with Muslim, guns, climate, autism, etc.