Quoted from Gov:All great games, LotR is the easiest of the three but also the deepest. STTNG is fantastic and can be pretty hard if set up accordingly. Great theme integration, sound and layout. Tron is just fast and cool. Can be brutal if setup that way, not very deep.
Any of those three is a good choice IMO.
LOL...LOTR is far and away the hardest of the 3!! How many times have you hit Valinor? Portal and Final Frontier are MUCH easier to reach. LOTR has the longest ball times, but it's easily the toughest. Depends on the definition I guess.