Only times I visit wikia, is when I want to know what girls we're going to get in the next 5-6 events. The wikia is still quite incomplete though, so I usually go to the Japanese site first, and then look the girls up on wikia by comparing their icon.

For girls we already have on Nutaku, I use the wiki here on harem-battle: http://harem-battle.club/wiki/Flower...Girl/FKG:Units
It's not perfect, and since we're responsible for keeping it updated ourselves, it is occasionally a few days late with updates, but it's very managable. And it has this very convenient Abilities page, for looking up girls with specific skills. I was actually browsing that one a few hours ago, to see whether any +DEF or -ATK magic type girls were added. (And we still don't have 5*/6* magic type girls with +DEF, and only Belladonna for -ATK, but she has the weakest version of that passive)