If your desire to fly in the RAF is so "tremedous" then you should go for it.
At the end of the day it is horses for courses. Remember that in the RAF you are an officer first and pilot second (assuming you get selected). Therefore if you can't see yourself as an officer, try the airlines. No experience in the civil arena myself but the money is gonna be better but is the flying going to be as much fun??
Decisions, decisions!!
Choose wisely my friend.