This thread might add a little info.
http://www.car-seat.org/showthread.php?t=144060
I'm assuming you are looking at the double strollers for both? At the moment, I have both so feel free to ask me questions. I've had the Twin Triumph for a couple years and the double Micro for just a few days. I've only tried it for two short walks, but so far, I am really liking the Micro. Yet, at the moment, I still prefer the Mac's fold (not that the Micro's fold is bad and it might be different if you have a minivan for which flat folds work well) and I have seat liners on my Mac so that makes it a bit cushier. But overall, I am liking the Micro and expect to be selling the Mac. However, my current needs might be different than yours and if I really could, I'd probably just keep both.
I think it really depends on your needs and your kids ages and sizes. For example, I think the Mac is better for a young baby because the Micro does not recline enough. Although, personally, I wouldn't put a newborn in either and my baby was already 3 months old when I got the Triumph. On the other side, my tall 4 year old fits in both, but I've found my Mac has gotten hard to push with two big kids in it now, whereas it pushed great when they were younger. Some things are personal preferences, like which types of handles you prefer to push. Anyway, feel free to ask questions and I'll be happy to help if I can.