Honestly, you can't go wrong with either of those Kamis. Vohu and Uriel hold the same roles which is to deal heavy burst dmg with fast burst gauge build, except that Vohu has a ATK/DEF elemental debuff (30%) which is super nice while Uriel focuses more on dealing enormous burst dmg. I have a preference for Vohu imo, you also have very interesting and strong fire Kamis so i'd pick Vohu for you in order to be beastly with Water since you have most of the "core" water kamis in your pocket. Plus, the event water weapons are really powerful compared to the fire ones so normally water grid should be better than fire grid.
Just my opinion.
Last edited by Yseo; 03-15-2019 at 04:06 PM.