Assume your methods on the first two are such that whether the auction starts 1S - 1NT or you open 2NT, you can find and 8-card (or better) fit in either major*
You are playing with a long-time partner that you trust (i.e. there is no reason to mastermind, or to hog the declarership other than for positional reasons). This is purely a question of evaluation.
1.
2.
3.
Does your view change if partner is/isn't a passed hand (depending on the deal)?
Does the vulnerability or form of scoring matter? If it does, assume all are IMPs, the first is love all, the second is game all, the third is love all.
[*a bit more on methods if you think this is relevant:
- Finding 5m will be easier if you open 1S and partner has enough to respond
- If you open 2NT you will be declarer in NT or either major, partner will declare a minor
- If you open 1S, partner will declare hearts or (nearly always) NT, you will declare spades or clubs.]

Help
