4cM are best in a strong club context, because the big weakness of big club is the amorphous 1♦ opening bid. By playing 4cMs, you get to eliminate a bunch of awkward shapes from both 1♦ and 2♣ - neither will ever hold a 4-card major. As an ...
I would always answer "asks me to further describe my hand" in either case, regardless of whether partner had correctly alerted or not. That is what they need to know, not what my next bid is going to mean (from ME no less!)
Disambiguating your canape out of comp is fairly trivial. I use a full relay with one partner and a more simple scheme with another, here is the simple one:
1M - 2♣ = GF, art
2D = all 4432 hands
2M = all hands with 5+ in the major
2NT = 4333 ...
@Weishu, bridge doesn't come with guarantees... but given that partner is going to normally be passing the double, it ought to deliver more defense than this hand provides. I'm aware that 4♠ is down two on the deal, but that is with this hand taking ZERO tricks ...
Interestingly, 5♣ might only be -1. ♠A lead, ruffed, ♣AKQ and another club. South is on lead and must lead a red suit... say a heart... you pick up that suit and now have transportation for:
1 spade ruff
1 diamond and
As you can see, it is something about which people might disagree. 4NT committed the partnership to 5♦ opposite the reds. I don't see slipping out to 5♣ on the off chance opener has a 7-bagger at the risk of a misunderstanding.
Partner asked you to bid your preference between the minors. So yeah, passing is saying "NO PREFERENCE" So I call resulting on this - the West hand has a very strong preference for clubs over diamonds. If you pass, partner is allowed to assume 3-3 in the minors and pick diamonds.