720 with 60fps I'd say is the best for FPV. You get a much smoother vid with these settings
https://www.youtube.com/watch?v=iH6UiYwWf0g&feature=plcp - 720 with 60fps
http://www.youtube.com/watch?v=Pk3EI4vKuSk&feature=plcp - 1080p can't remember the frame rate
hope this helps
