Same here. PPSh would be the one. Knew a guy who carried one in Iraq as a personal weapon just after the invasion. Had that and a Webly for the simple reason both worked. Trashed them when he rotated out.
It was a relative piece of crap. It was a cheap, readily produced weapon like the Sten, to mass produce quickly for the front. It was flimsy and full of quirks and flaws. The Thompson was a much better weapon, but was more costly and complicated to produce.
Im not a huge fan of the grease gun. The only reason it was made was to produce in larger numbers than the Thompson and make the cost a lot less.
I do think though provided it was cheap and all it was a good smg especially for paratroopers and armored. Its rate of fire also made it easier to aim with.
But with the Thompson; "rat tat tap, away with the Jap!"