I suppose it's a matter of what you get used to. All 3 of my rifles (2 x P-H and 1 x BRNO) have flag safeties, and I like them. The only side safety I have experience of was a CZ, and that could be accidentally knocked into "live" just by thinking about it! Horrible. An accident just waiting to happen.
@Mouse has a Parker-Hale (.243) with a shotgun style safety, and that's really rather stylish.