LotR is one of 3 Stern games I own (with TSPP and WPT, Thank you Keefer). It's a great game and offers numerous strategies to gameplay. Spidey is a good game, but I have seen too many people doc ock all day, so it's stock has gone down for me.
Play the games and go with the one you want to play the most! Or even better... get BOTH!