I would rather fly. If you could read people's minds you'd know everything they were thinking, good and bad...but personally I wouldn't wan to know if someone was thinking something bad about me.
But what if they were thinking about something really awful that happened to them (losing a loved one, being abused, etc.) It would be too sad...and plus what if they were thinking about doing something horrible (kill someone, rob a bank, etc.)... yeah, you could probably stop them, but if you could read everyone's mind you couldn't stop everyone that was going to do something bad....that kind of knowledge would be too overwhemling for me.