keep in mind, that right now we have Sol and Amaterasu in the pool, 2 of 3 (including Cthulhu) "god-tier" kamihime, so waiting more will mean diluting the pool with "average" SSR hime, thus reducing your chances to get Sol/Amaterasu. On the other hand, we will probably get Cthulhu and some other great kamihime, like Aphrodite before ticket expires, so it might be better to hold on to it. Basically if you need something from current pool (Sol, Amaterasu, Gaia, Shiva, Poseidon, Thor, Amon, all great hime), its better to go for it now for better chance to get what you want, but if you need something from the future pool, then waiting is the way to go.