Voted P239.
However, I admittedly have little interest in owning either SIGARMS or HK USP (and derivative) pistols.
Don't care for the HK triggers. Dislike their incredible fascination with how many moving parts they can fit into a pistol and still have it function.
Makes them the honorary Cuckoo Clocks of the handgun world.
Been handling and shooting Sig Sauer pistols since they were imported as Browning Double Action pistols, and while the newer generation models are improved in many ways over the earlier ones, I just can't get too excited to spend my own money on them. The ergonomics are decent, the triggers better than HK USP's, but they never really appealed to me enough for me to spend my own money on one. Came close to it on an older P220, once, even though it was typical in the way of being a bit fussy in liking JHP bullets of the time ...
If I do decide to pick up a SIGARMS before I retire, I can say I'm pretty sure it'll be a P-239 chambered in 9mm ... if it's offered at the right price during an armorer's course sometime.
The P239 is the only other metal-framed, compact 9mm, single column magazine pistol which I feel equals my 3913 in overall ergonomics (for me), as well as reliability and practical accuracy.
Don't mistake my comments to imply I think the HK USP/variants are 'bad'. I don't think anything of the kind. I've always shot very well with them, despite the DA/SA trigger to which I'd refer to as mediocre, at best. I tend not to like the LEM, but I can certainly see it being the emphasized, simplified design of the next 10-20 years for HK LE/Military pistols.
Just doesn't interest me, when it comes to my money. I'd carry an issued one, if need be, without losing much sleep ... and certainly don’t mind other folks liking and enjoying owning them. Not at all.