TWD Premium has a LOT of extra features over the Pro.
That said, I've owned an LE, Premium, and Pro model.
I've sold them all, and decided recently to buy a Pro once again.
I prefer the play of the Pro model. Specifically, the left ramp is 1 piece, instead of having the lifting bicycle girl piece on the Premium/LE.
I've played a few Premiums that were dialed in really nicely, but none flow quite as well as the Pro, in my opinion.
On the other hand, the Premium and LE models have the walker bomb button (among other things) which can be a game saver under the right circumstances.
I truly think that if you had either one and never knew about the other, you could swear it's the perfect game in either case.