Burek on 02 June 2015
Will play both, and am about equally excited for them. But I do find them different enough to enjoy them equally, and to avoid comparing them.
UC is more humorous, TR lends a more serious tone.
UC is more cinematic, and has more combat, TR is more for exploration (if only they decide to add more puzzles)
Also, TR is a franchise I've gotten to love over the past decade, playing Anniversary, Legend and Underworld with my wife and both of us enjoying all games on multiple playthroughs.
I've only played UC last year, all 3 in a row, liked them a lot, but I simply have more emotional connection with Lara than with Nathan.
Tomb Raider wins for me...
