What School?

I'm at the end of my tether. Everyone else has decided where to go for Sixth Form and I still have no idea, but it's between two schools now.
The first I've been at for 12 years, everybody knows me and I fit in really well, some of the teachers are like parents to me. The only trouble is all my best friends are leaving and although the other people are nice, it's just not me. Also the grades aren't very good and the Physics and Chemistry department aren't great.
The other school has much better grades and I've really liked the Physics teachers when I've been there. There are loads more people so I'd probably make more friends, however, the people I know that are going there aren't very nice.
WHAT SHOULD I DOOOOO???
sorry this is so long