I've never liked MM—great color selection, but they just don't seem to work well for me, and they seem to have greater problems with adhesion than most.
I love PollyScale. speaking as a former "paint professional" they are a joy to use, very forgiving, great adhesion, beautiful finish, and decent color selection. The only drawback is that they don't brush very well—poor hide.
I am also a dedicated Tamiya user. I use them as primers and as basic colors. Not as easy to use as PollyScale, but otherwise great paint when used properly.