I've played with pretty much any film I come across, and in terms of cost-benefit I've settled on Fomapan films. I like the grain structure, they are some of the cheapest BW film available and have great latitude if you like to mess with stand development. I shot this photo on a Pentax ME camera using Fomapan 100. Developed at home with Ilfotec DDX and scanned with a Canon 5D Mk3 + Canon 100mm f2.8.
Definitely depends on my mood, but my go-to's are HP5 and Fomapan 100 because I stocked up on bulk rolls and I'm still working through it. I've also got a little stash of Agfa Cinerex IC1N that I like to shoot with, it's a little slower, but it tends to be quite contrasty without the need for orange/red filters or pusing. This is an older shot from when I was messing around with it, I think from my very first roll.