Oh yeah, if you have a choice between the RAF and USAF I would say the USAF. Many more aircraft, more missions, and so on. However, you're going to have to make a choice on where you want to make your home. With aviation it is difficult to move from continent to continent. I know because I have both the right to work and live in Europe and in the US. In aviation it's very expensive and time consuming to get certificates that are valid in both the US and Europe. Hopefully, that'll change with the JAA over time. Plus, there are just more flying units in the USAF than in the RAF.