Originally Posted by
Daracaex
Both? I'm pretty sure the two terms refer to the same race.
Currently working on actually completing the game now so I can figure out why you have multiple locations listed under "Sin" and what on earth the Omega Ruins are...
FFX Game spoilers:Spoiler
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"Sin" in the end game becomes a dungeon. Each listing above is a particular location in the dungeon.
The Omega Ruins are a hidden location that has very, very high powered enemies in it. It's where the Omega Weapon is at, along with the Omega Weapon's boss is. Both are fightable. I suggest you Bribe the Omega Weapon for his goodies.
As for the Ronsos... I'd actually go the reverse of the Medium size with Powerful Build. Instead, make them Large with Slight Build. It just seems that way, or at least did for Kimahri. He was larger than everyone by a good deal, yet fit in at locations that couldn't have been made for people any larger than Hume standard.