The best Rs right now are Zephyrs and Konohana Sakuya. Daphne is an alright R attacker but she's nothing particularly special other than having the highest atk for a R, which isn't even that much, but also has the lowest HP value, which doesn't help at the fact she taunts the enemies.
Awakening SSR himes. Don't use it on anything else unless you're a hardcore cash player with a ton.
This all basically applies to Kamihime as well. You can finish every event in this game without the use of SSR himes, especially if you put as much time as you did into Aigis into this game. Rerolling in this game and any that allows you to draw from the entire pool is literally just a free ride to whatever you want and people are simply telling you to take advantage of that.