Who do you like more and why?
Personally, I like Shuyin more. Here are my reasons. If you haven't gotten to Chapter 3, yet, I advise you not to read on and/or look at these pictures of Shuyin. There, I warned you about spoilers, so no need for spoiler tags.
Shuyin:
http://www.ffshrine.org/ffx2/visualarts/057.jpg
http://www.ffshrine.org/ffx2/visualarts/056.jpg
Tidus:
http://www.doupe.cz/vaulty/finalfant...ures/tidus.jpg
http://digilander.libero.it/sephyr/G...ff10/tidus.jpg
Lenne, Shuyin's one and only lover, is sent to the front lines of a war to basically fight and die. What does Shuyin do? Being the huge mass of ownage that he is, he doesn't whine, complain, or cry. Instead, he sneaks into a heavily defended base and tries to steal a weapon of mass destruction to save Lenne.
Tidus finds out that Yuna's going to die by summoning the final aeon. What does Tidus do? Being the chickenwuss that he is, he whines and complains for a few hours, instead of thinking of a way to save Yuna.
Shuyin > Tidus? I sure think so. Shuyin's even buffer and better looking than Tidus.