If you compare the two then naturally poma's pond is bigger considering they are doing multiverse thing. But, game play wise I prefer AC.
I don't know if anyone noticed, but AC's game mechanics are one of a kind. Different backgrounds synchronized, fighting style synchronization, weapon smithing, racial traits, synchronized elements, and the choice to bear any weapon you want, mwuah chef's kiss.
The adventure and game mechanics are very reminisce of RPG games. The fact they coded all that is very impressive.
And of course harem. Anon is legend just by including harem.