You've basically got 4 types of mech shows.
Real mechs in a real mech word (Votoms, Gasaraki, FLAG, 08th MS Team, Patlabor)
Super mechs in a real mech word (Gundam)
Real mechs in a super mech world (I can't think of any and don't really see how this'd work so it's really only 3 types of mech shows)
Super mechs in a super mech wolrd (TTGL, GaoGaiGar, Macross)