If I have Cthulhu and SSR Nike, who should I pick for this miracle ticket?

Snow Raph is tossed around a lot, but I'm still running Mordred right now and can get sniper shot pretty soon if I want, so her b-frame debuff doesn't look all that good. I also have Venus who has a party-wide 15% damage cut- obviously not as good as 30% but thats another skill that seems kind of underwhelming since I already have a hime that can use it. Plus, I've heard that water is going to shift away from control/debuff and into a more burst-oriented setup in 2019. Would Asherah be a better choice then?