I'd actually try both. The Outlaw 7700 has a tendency to have noisy transformers. When I tried mine they could be heard a-humming from listening position 8 feet away.

On the other hand, the MPS1/2 won't have that problem since the transformers are much smaller, but it does have one fan for each channel, so you may run into fan noise.

BTW as far as I can tell the MPS1 and MPS2 are the same exact unit just with different face plate, so you may want to look at the MPS2 instead since it is a bit cheaper.

But yeah, I would get both and try them against each other. The Outlaw is a good amp, but I couldn't keep it over the B&K 200.7 I also tried because of the noise the transformers were making (not ground loop hum btw, but actual "mechanical" noise from the transformers).

Sure, if you try both you will be out a bit of shipping money for sending one back, but you will have much higher peace of mind. How much is that worth to you?