I don't think so. FKG is 5$ a pull for like a 0.8% chance of 6star, this game is 1$ a pull for a 1% chance of SSR or whatever, but you can use spare rares to build up to UR, unlike FKG where all your excess pulls are useless to you.
The only thing that redeems FKG's ridiculously overpriced gacha is the fact that you get so many gems without spending money that you don't need to throw too much money at it to be successful. But assuming you're gonna whale for it, I think FKG definitely gonna be the bigger whale spot.