I use TMax 400 for most of my photography, for the same reasons Michael mentions above. It's a bloody good film that has everything except coarse grain. Its tone curve is malleable so you can get many different results based on how you expose and process it, which means I need only one film to get what I want from my pictures.
If I had a faster shutter for my 6x6 pinhole camera I would be using nothing but Tmax 400 in all my cameras.
Keep it simple, indeed.