Both are outstanding games! Really, this one is really a personal taste question, you should play both and make a decision for yourself. There is no right or wrong decision purely based on just looking and playing the machines... only you know which one you personally will like IMO.
That being said, I owned LOTR LE and SM at the same time, and kept LOTR and sold SM after about a year. After SM was gone a while, I missed it, and just ended up getting another one. Both are super fun games.
So as you can tell, LOTR won out for me when I had to decide which one to move.