What has format size got to do with the type of metering you use?
For me, I'm more careful with metering when using sheet film (as Alan stated above) because I can adjust development for each sheet, so it's worth taking the time and being more precise with exposure. Hence, I mostly use spot metering with sheet film.
It's also about speed and cost. Since the cost per frame goes down as format size decreases, I generally shoot more frames and shoot them quicker as formats get smaller. I'm more concerned with getting a possibly fleeting shot and less concerned with "perfect exposure" in those situations. Hence, I am more likely to use incident, reflective, or "sunny-16".
Take all this with a grain of salt as I am not a pro, don't pursue sales of my work, and only shoot for fun.