I’ve owned all three titles. If you are open to possibly moving on in the future, it doesn’t really matter. Get the one you like best. Try not to overpay so you won’t be stuck with it win you are ready to move on. Unless, you don’t mind taking a loss for the price of having it for a while. I think of it like rent.
I’m not buying from your perspective, but $8500 doesn’t seem like a good deal for my personal tastes. That's not a criticism of you or the seller. I just prefer used with more plays and lower prices.
WOZ and Tron totally capture the feel of the movies. The play styles could not be more different. They would actually compliment each other well in a small collection. GOTG is really enjoyable with the Cleland code adding much needed musical tracks.
Best of luck!