Matchpoints - If 1NT is in any way a sane opening, 1NT is the correct opening. It takes out the 1-level, describes your hand nicely, and oppos don't tend to compete. IMPs, weak 1NT - Always open 1NT because I'll be stuck for a rebid. IMPs, strong 1NT - Not playing Gazzilli, always, because I'll be stuck for a rebid. Playing Gazzilli, if I prefer the lead to end up in my hand, I'll open 1NT.