I agree w/ Aidoru
since an SSR Kamihime makes it much easier to do events in Kamihime (well you can say the same thing for Rainbow girl in FK but in FK, you can still clear modes w/ 5*/Gold)
However in Kamihime, it's shit harder to clear modes with just SR Kamihime
then again, I don't have Eidolons max out due to me having not enough free time due to work
Kamihime requires more time to grind than FK in my experience