I have been shooting Lugers since about 1962 and still can't figure out why they are supposed to be so obsolete and awful.
Feed them straight Sten Gun loads, make sure the magazines fit properly, and oil the poor thing once every 6 months and you'll have no troubles. As far as breaking the thing is concerned, I think it's the only automatic of the period that you could crack some jerk upside the stahlhelm with the thing and not break the gun. And you can put a shoulderstock on them and really shoot.
My choices would be the Luger first, Browning second, P-38 last...... and remember, I own Lugers and a P-38. For a serious social encounter in my kitchen at 3 AM, reasoning with disadvantaged young offenders who are indulging in their hobby of home invasion, I would not feel at a disadvantage with any of these three...... but would still prefer my Webley Mark VI. It's got that h-u-g-e HOLE in the front end that tends to overawe.