[AL78]

Matchpoints against the same decent club pair:

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1NT is 15-17. Do you lead partner's suit or top of your sequence?

[LBengtsson]

little or no chance of ruff with doubleton ♠, also partner is under strong no trump bidder so ♠ lead may give tempo. safe lead ♦K. set up a trick or tricks quickly.

[nige1]

AL78 'Matchpoints against the same decent club pair: 1NT is 15-17. Do you lead partner's suit or top of your sequence?
++++++++++++++++++++++++
I rank
1. ♦K with a partner who expects you to exercise judgement.
2. ♠9 With an "I bid 'em, you lead 'em" partner -- who will be upset if a ♠ lead would have worked -- and his mantra of complaint is likely to wreck your game and his.
3. ♥T.
4. ♣J.

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[Douglas43]

Very close.
Partner has bid 2♠ vulnerable so should have serious spades. At most we have two spade tricks. If partner has AK and the suit is 6-3-2-2 and the doubleton is on my right, a third spade might promote a trump trick for us. As against that, if partner only has AQJ we could lose a a diamond trick (say dummy has only one spade and declarer has the king).
I'm normally a "You bid 'em, I'm leading 'em" player, but on this occasion, it's K♦ from me.

[AL78]

The full layout:

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I thought about this and struggled to decide between the two most viable options, and eventually decided to lead my top spade, on the basis that whatever lead I choose, if it goes wrong and the other one would have worked, I won't lose the post-mortem.

I didn't lose the post-mortem and my lead was wrong. Declarer wins, starts ruffing spades in dummy. I ruff in on the third round (not realising I was ruffing with a natural trump trick) and played my top diamond. Too late, declarer drew trumps in two rounds and because the clubs are 3-3, the diamond loser went away on the ♣3. 4♥+2 was a bottom, everyone else led the diamond. Cards lie perfectly for declarer and for maximum punishment for finding the wrong lead.