I don't know why Atlas has so many "models". Everything they have is pretty much the same gun.
Instead of having the apollo, eos, athena, ares, etc. They should, in my opinion, streamline their guns sorta like staccato.
At the end of the day, these are all 4.6'' guns. When you go to staccato website you either choose steel or aluminium, X series slide cuts or or not, now add in the ported part.
These guns should all be Athena's. Then you choose what slide cut, ported barrel, aluminum or steel grip.
Once you've had one atlas pistol you've had em all. Shooting wise the erebus is the only really mind blowing different one. With their longer lead times and way higher prices I think Atlas is not the way to go anymore.