I vote for C128 purity. The C128 is my one true love.
If I want to listen in on the C64 buzz, I go over to Lemon64. Kim does a good job over there, and there's plenty of action. The S/N ratio is not as good as it is here, but that's to be expected.
As for PET, I never owned one (though I DID have an Ohio Scientific Challenger 1P, which was essentially a PET clone). The small amount of interest I have in them is strictly historical.
So, C128 all the way! Yeah! :cool: