Leave or stay

for god's sake i'm getting insane. the prof i'm working with now, suddenly told me he's willing to take me for my 4th year project course. before i came to his lab in early summer he was telling me he can't promise a project to me, because he thought my marks weren't up to his standard. well, that's actually equivalent to a soft turning down. so i looked for another prof in the department, with his office and lab in the toronto general hospital. now i have to make a choice. i really hate making choices, i wish someone could make for me.

there are pros and cons for staying and leaving. i'm already familiar with the working environment here and my 4th year project will probably be a continuation of what i'm doing now if i stay. no transition needed, everything will just go on smoothly. besides most classes i have next year will be in the building i'm working in now, so i don't have to walk around between classtime. if i leave for another lab, that means i have to start everything anew... but the prof in the TGH is really nice to me. moreover if i work with him then i'll be able to get 2 reference letters from 2 different supervisors in the future. i approached the TGH prof first and now if i'm thinking of withdrawl... it's just not right....

actually i prefer working on genetics instead of proteins. but since i'm in biochem, all the biochem labs and projects will just be focusing on proteins. i've no choice... who can give me some suggestions?????