Gah! Sakura sometimes annoys you too, sugahcat? Sometimes she seems way, way too perfect in TRC. It's basically MarySue!Sakura. In CCS, at least, she got angry and sometimes acted a little bratty, but we never see that side of her in TRC.
As for the actual question, well... I adore Fai. He's too cute, and so very angsty. Perhaps he's been a coward, but that's alright. Nobody is perfect. So, I'd say him... except that Kuro rocks my socks.... so freaking awesome... So it's a tie.
Syaoran and Sakura.... at this point, I'd have to say Syaoran, as much as I love Sakura. Syaoran really, really needs to lighten up, but he's adorable.