I'm not sure about the mini stack, but I've heard the MG15CDR before, and the power of the amp can't be compared with a Smarvo 40w. I guess the result will be similar with a mini 15 as well, as it's a 15 watter like the MG15. I would recommend the 1x12" over the 2x10", but the choice is yours. The only gripe I have with the Smarvo 40w is that it sounds miserable at low volumes, almost like it's begging to be played loud.