(1) Which category (if either) has an advantage by Occam's razor? (2) Which category (if either) is more easily falsifiable? (Meaning easier to determine improbable, since it is hard to falsify them entirely)
For me, I see neither having an advantage on (1), but on (2) there are a finite number of relevant, well-known lab techniques that could be investigated.
I think that branch is past what scientific dialog really covers, and it's probably the methods and standards of proof from legal exploration that might be the way to progress the discussion. Unfortunately, the world is missing a moderator that folks would broadly trust to facilitate that conversation.