Best ROM (stable)

Good night ,

A friend of mine asked me to install a ROM on his i9001. The phone is completely stock.

I'm not asking for the best ROM available, because i know that that it's against the forum rules .. I just want to know which ROM as less bugs, because my friend doesn't understand anything about this, and if something goes wrong , he's going to blame me lol.

Please help me :)

Thanks