Right now I use Kentmere 400 developed in Xtol 1:1. (about 9.5 min at 68 deg F.) I have used tons of Tri-X in the past, though. I like the less-contrasty and slightly higher grain of Kentmere at the moment.
I have 4 main lenses for my Leica M4-P. The Zeiss Biogon 35mm f2 is probably the one that gets the most use. I tried a new Voightlander 40mm f1.4 and an old Canon 35mm f2.8 LTM before arriving at the Zeiss, which blew them away in sharpness and contrast. I also pack a 21mm f4 Voightlander Color-Skopar (which I like a lot), 50mm “Dual Range” Leica Summicron (which is great for close-up work), and 90mm Leica Elmarit (which is amazingly sharp).
I occasionally shoot medium format as well with Pentax 6x7, or Fuji and Mamiya 645. I’d be glad to talk about those lenses too, but I’m guessing you were curious about Leica M system…
Hope that helps. I’m glad to see someone else shooting film on an M4-P in Minnesota!