The OP asked which branch he'd have the best chance of flying in. The Air Force has the most aircraft, so.....seems like a no brainer to me. That's what I based my choice on. But I'm definitely not the smartest peanut in the turd, so take it for what it's worth.
Actually if you count helos the navy has more aircraft than af and just like the army has more boats than the navy. Go figure.