I don't want to stray ppl away from their mindset of selling/trading pins, but here's my thoughts on the subject since I nearly did the same:
Rules are no doubt better in GOT. But I gave my STLE a tune up and re-dialed it in and nothing beats the sounds, show, and warp ramp. Had a couple offers for my STLE and a WOZ trade and even after 2+ years with STLE, I couldn't do it. The game is one of the best despite needed another solid update. So yea, GOT wins in the rules dept, but STLE wins in every other dept.
If GOT pro is a keeper, why sell ST pro to upgrade to GOT PREM? I mean this pin has to be most different playing pin from its LE counterpart. I think both are great and if you want to sacrafice that speed and flow for a more technical game, by all means go for it. The mini pf is one of the best created and maybe I'll have a more positive opinion of the flow of that pin once stern fixes the left orbit. Don't get me wrong, PREM is great; I really love the right orbit to throne shot, but I really don't like the right ramp to mini pf shot. Too much time on the upper pf for my liking; maybe code will make the mini pf more desirable to play it every 15 secs?
This is one of those pins where owning both versions is an actual possibility and I thought about that by selling STLE to do it. But in the end, I just didn't couldn't do it. Maybe later on. I wonder if the people wanting to sell their ST don't have the warp ramp dialed in? I know for sure I was fighting my warp ramp last month, only getting about 6 or 7 warps a game. Almost sold/traded it then. But gave the game a little tune up and dial process and I'm back to 20+ warps a game and just had one last night with 40 or so warps, enterprise amok, and 2 missions from 5 year mission. Say what you will about the rules, but the vengeance modes are great, most of the missions are a blast, and the gameplay is one, if not the best, 3 flipper layout around. IMO.
Bottom line: get some time in on a GOT PREM before deciding and make sure your ST warp is dialed in.