-High cost, heavy tuned powerhouses only. OP.
-Low cost, min/max tuning. OP.
Have you considered the differences in psychology between different servers at all? Americans are so well known for being the all-out attack gamers with aggressive play. Moonlords give EVERYTHING to support that. Super armor, range to zone and cover, dashes to get in, relentless attacks, absolutely absurd damage.
As far as I know, Asians have the more tactful approach to fighting. That is not to say all (looking at Korean Street Fighter's Poongko), but the general idea is that Asians are more or less opposite of Americans in playstyle. From what I can see, that is true. Abundance of characters that require more thought to not get hurt or more passive play than something like Moonlords.
TL;DR American Moonlords OP. Real talk.