I think vegetarian pizzas actually work better in some cases as there's less of the flavour being focused on meat, so more unusual/exciting flavours show up. They're usually cheaper in restaurants too, now that I think about it...
yeah and you dont get as full as it were a lot of meat and stuff on it. bolognese and taco pizzas can work if done right but yea in general i prefer vegetarian
Bell peppers and onions. Yuck! My favorite pizza place sometimes manages to hide one of those on my pizza. Finding it is like finding a boobytrap and it ruins the rest of the pizza.