I can only comment on the BBE Bmax-T, I think I own it for about 8 years maybe 9 and it's a very good pre-amp.
As mentioned before, you can't get tube grid out of it, if you want that you need to look for something else. But if you don't need that overdriven sound you probably won't find a better pre-amp then this unit. It sounds warm and crystal clear(two things that aren't easy to combine) and it's very low noise. The only complaint that some owners have is the Fender tone stack, but once you get used to it doesn't matter.
The Ibanez Club #951, Dutch Bassists Club #23, SJSS Club #101 - 2x10 with coaxial mid/high driver, Bugera BVP5500