I have a preset crop in my editing programme that automatically turns 16:9 to 4:3, and then I can manually shift it around to make sure I'm not missing anything in the frame.

Though I prefer 16:9 I found it easier to make everything 4:3, because generally the subject is centered in the frame, so losing a bit on either side rarely has a detrimental effect on the clip. I've found that trying to make 4:3 into 16:9 often results in the tops of people's heads being lopped off.