Quoted By:
Mega>Dyna>Z>Tera
Megas are obviously cool from both an aesthetic and mechanical perspective, though some designs are questionable.
Visually, Dynamax is inoffensive at worst, while the gigantomax designs were consistently pretty good and (no pun intended) expanded on the designs. Mechanically however, it's disgusting.
Z moves were just powerful moves. Inoffensive for both better and worse.
Terastal is fucking hideous. Maybe there will be some mons with unique forms that won't look as bad, but rhinestone crystal skin looks awful on its own, the giant stupid hat is just the shit on top. (Un)fortunately, it does look mechanically sound, so maybe I'll warm up to it a bit.