I don't really know, I hastily picked SC2 Link because of what he meant to me...
Realistically the choices I had in mind were OoT/MM Link (they're the same to me), SS, TP, SSBM/SSBB (they're the same Link, Brawl just has updated looks), and SC2.
OoT/MM Link: He's cool and all, but he shows little to no emotion. With the upgrade to OoT3D, they sort of ruined his appearance with his ridiculously huge anime-style eyes, but it's whatever (design flaws don't mean all that much). He's a hero at the core, and with the lack of emotional scenes in OoT, I can't say all that much. However, since I include MM Link...he's just a great candidate for all that he did for Termina. Definite 10/10
SS Link: He loves a girl. He gets bullied. He's like a son sort of to the headmaster of the Knight Academy. What more can I say? Oh, and That scene where he nearly broke down to tears. That's all. 9/10
TP Link: He looks really mature, and I loved his ferocity that he displayed after King Bulbin had captured Colin. He was clearly ticked off, and I wish Nintendo could pull that off again. The problem I had with TP Link was that he displayed emotion but mostly in the wrong places (imo). He somehow had a love relationship with Midna despite her constantly griping and complaining and ridiculing him. That's sickening. 8/10
SSBM/SSBB: Subspace Emissary. He's awesome. That's all. 9/10
SC2: Easiest character to break the AI, although he ranks poorly on the tier list because he has very unsafe moves (to hell with the tier list). I beat Weapon Master using only him and Nightmare. 11/10 for pure, unadulterated awesomeness.