Aeriths is the equivalent of a pastor's daughter that likes to be a cock tease. When you finally can convince her that the lord is oft-forgiving and you smash, she doesn't suck dick or swallow. She pretends to be Mother Theresa, asks you what your favorite Bible verse is and has a shirt with a bible verse but doesn't know what it means. That's Aeriths.
Tifa, on the other hand, is the equivalent of an IG thot. If she ends up being annoying, give her some of that herb. She's willing to smash at all times, no Hail Mary effort needed with her.
Sorry, you are destined for a life of disappointment if you couldn't sort this one out. Rustic clothes, bright colors, always giggling, likes crystals; Aerith is a hippy chick, not a choir girl. Extreme lapse in waifu judgment, here.