Epi and M4OHN are very comparable in effects. They are definitely my two favorite of all the legal ph's (or used to be legal). Epi should yield better gains than M4OHN, but is slightly harder on the liver (though pretty mild still). They both should make you feel fantastic, they're both dry.
M5AA isn't in the same league as a standalone oral, but is very mild as far as liver toxicity. It stacks nicely with others. My fave was M5AA/M4OHN. Yum.