In Rocket League, you can keep the camera facing forward or locked onto the ball. Usually I go the entire match using the camera that locks onto the ball. This gets a little disorienting when the ball goes high and your car scrolls out of view. When should I be using each of the two camera modes?
It's completely up to you. I used to like the fixed camera back in SARPBC but since I've gotten used to the ball cam in Rocket League, I prefer that one much more any time I'm trying to track the ball.
It's a lot easier if you can get used to one camera mode, but if you really want to switch off, use the fixed camera when you want to know where you are and the ball cam when you want to know where the ball is.