I always played in 1st person, it seemed easier to aim (even though it shouldnt make any difference), it was way easier than switching. and I liked to feel like I was the one flying around at near 120mph
I always use 3rd. I definitely agree that 1st helps aim when it comes to rockets and nades, but the benefits of 3rd outweigh the benefits of 1st for me.
as i would say switching is the best if you got bored you can just switch
i've played 3rd person at first then i started to play 1st person it was best for me