I hope this doesn't come across a$$y, but I feel like putting is more about what's going on between the ears than between the fingers. Circle putting especially, the mold is really secondary.
My two cents, start with the plastic you like the feel of. Sit around watching TV or whatever and hold some putters and see which one you notice in your hand least. Go with the color that says "going in." Don't mess with one if you think the name's stupid or if the stamp looks ugly.
I'm kind of kidding around, but my theory is, you'll make more putts with a putter that you know is the one, rather than hoping to find the one by putting and seeing which goes in for you. That's the cart before the horse, so to speak.
Then it's just, the basket is your buddy. Toss it to your buddy.
One guy's opinion.