Definitely go to p2p. If you merchant (as i did on f2p and do now on p2p) a whole sea of profit oppurtunities open up when you make the change. You could start merchanting barrows, d weapons, treasure trail stuff, etc. The point is that p2p is guaranteed to be faster at moneymaking, because if you can make 1mill an hour on f2p you'd be rich on p2p.