Which level 5 monster is the best?

Gorgons are strong, that's undeniable, but show me someone who can defeat them with level 7 units. Even Grand Griffins will tear them apart on their own territory. I'm for the Birds; they're agile and have lightning attacks (though rarely, Eye is more common – just choose an odd number, and it will be more powerful). In the Dungeon, Minotaurs rule, even Cyclops are no problem for them (Titan Pride map is an example). And Magma – there are two heroes with whom the attack damage, etc., is the same as for Phoenixes, but there are more of them.