Arboreal and semi-arboreal species seem to be way more flighty(in my limited experiance and opinion). I'd get a lot of experiance before beginning to keep those.

I always find it irksome when a vendor outright lies about the origins of the animals they sell. When I bought my first blackthroat Moggie, I was TOLD she was a CBB, but the first look from someone with experiance said "Nope, that's a wc". Looking into it more, it was true, sadly. There aren't a ton of folks working with monitor species in the US, so it should be easier to ID those that offer CBB and those that don't. But it seems a lot of sellers will simply lie and say they got them CBB from a breeder just to not admit it's all WC animals.