Your everyday lead

This truly is an 'everyday' problem and nothing to get worked up about. I lead a ♣ on these hands, almost automatically.

I would not dream of leading trump here: I have NO reason to expect ♦ shortness on my left (nor, if it exists, to be able to meaningfully prevent a ruff) and a trump lead may do one or both of two bad things: cost a tempo and/or blow a possible trump trick (give partner Jx as a simple example).

A ♦ is almost as silly a lead: it won't likely blow a trick but it sure will blow a tempo. I see no reason to make a deceptive lead suchas the J from QJx.

I generally dislike leading from Jxx or 10xx. Such leads rarely seem to work and could easily blow a trick in the suit. Give dummy a holding such as KJ9x opposite Axx. Now, any lead in any suit cold blow a trick, but your lead choice should be influenced by a balancing of risk v benefit. I prefer to lead my length in these situations, since my possession of length (slightly) reduces the risk that I will be giving away a trick. Of course, it also slightly reduces the chances that we will be taking multiple tricks in the suit.

I might (but probably would not) lead a ♥ if I were desperate, but I rate my defensive holding here as equivalent to 2+ (2.25) tricks so am comfortable being conservative.

This is also one of the auctions that can work well for 2/1 and Forcing NT. Dummy can have absolutely anything from a 3037 to a 3334 distribution, and we have no idea whether we need to set up tricks (in which suit?) or lead trumps or go passive.

So I can easily construct many hands consistent with the auction when any suit is right.

Where does that leave us?

I don't see the point of a diamond, deceptive Jack or not, because we know it's declarer's long suit (although in some 2/1 styles declarer could be 5332 and a diamond is then more attractive). While we might need to attack diamonds before dummy's suit is set up, it's more likely just to be helping declarer.

If I had a decent honour holding in clubs or hearts I would lead it, as I tend to make aggressive leads.

I also don't like a trump from this holding. Again, it could be right, but it seems likely to blow a trick too often when there's no strong indication we need to lead trumps.

That leaves me with the boring club.

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