if you want to get those illly smooth slow motion shots, go with the r3 setting and slow them shots down. Also r3 setting is the widest option as well.. something else you may want to consider. I always use r3!!
720 @60 makes the most sense to me, everything looks smoother and you can us MEGA MO! I'm almost certain this is was shot at 720P @60FPS, feel free to correct me though.
960 @30 gives you the widest vertical angle looks like this.