I use Ilford FP4+ in all sizes from 35mm to 5x7", and only use other films when I (A) need something different - like IR or colour, or (B) have run out of that size. Depending on the developer I expose it at 50 to 200, but can't really convince myself that I couldn't shoot everything at 50.

Sometimes I use HP5+, but that is rare.

Since Norwegian vegetation tends to be very green I stay a long way away from all Fuji colour films, I prefer the colours I get from Kodak.