Gonna have to go with Harry Kim. Nothing against Garrett Wang, but he was a pathetic character.
But, if B4 had about 5 more minutes of screen time, then it would have been him. What a completely unneccesary character. I re-watched Nemesis last week and it struck me (again) that B4 and everything to do with him (including the Argo ride) could have been completely cut from the script and the movie would have been significantly improved.