I have tried with both Microphen and D-76. I generally liked the Microphen results better in terms of shadow detail.
Here are my times:
Microphen: stock (1:0), 12 minutes at 20°C. 30 secs initial then 2 gentle inversions every other minute.
D-76: stock (1:0) 9.5 minutes at 20°C. 30 secs initial agitation then 2 gentle inversion every minute.
I have attached a sample with D-76. I don't have Microphen scans right now, but I can certainly make one if you are interested.
I think it depends on what you want-high contrast, grainy photo- journalistic looking images akin to 1960's rock concert stuff or a smoother total range with manageable grain and highlights. I like diafine very much for the later. You actually get a 1600 speed film while keeping your grain relatively unobtrusive and your highlights tame and printable.
I've blew some of these up to 20x24 and they look fine In fact, the shadow detail is amazing:
I've been using d-76 1:1 at 14min, agitate 30sec sit 45. I've been doing it for years and it works well for me. Mind you they're usually rock shows and to me, if tri-x was music it would probably be punk rock. It all depends one what you shoot and what the mood is. If I were shooting a jazz gig, I'd probably shoot with tmax 400 or something less grainy.