User blog comment:Shinhwalee/Major Event Preparation Guide for Admirals/@comment-13988853-20150417101156/@comment-3502824-20150417104836

You can either level Fubuki or Maya to Kai Ni. One thing for sure is that leveling Maya to Kai Ni will save you buckets since World 4-3 Power Leveling will still cost you buckets since damages to  your support ships build up in the long run from all the preemptive torpedoes by the submarines or if you get wrecked in node J. World 3-2, you only gotta worry about your submarine getting repaired so no buckets involved much unless some derp happens. Having powerful ships as Maya and Fubuki Kai Ni is nice though.

And Type 94 > Type 91 for sure, and it saves you screws to upgrade from Type 91 to 94 XD;;

Getting Souryuu to Kai Ni is highly recommended because of her stock equipments. Since she also gives a 8+ AA Fighter which is helpful if you lack Reppuu or Shiden Kai-2.

As seen in my guide, Junyou loses some Air Superiority power by going Kai Ni but she at least gives you a free Reppuu, so that should be taken into consideration. Ryuujou.... maybe I should have put her in the Guide but frankly speaking she is not that good... in both Air Superiority and Plane Slots somewhat... =w=;; (I mean her 3rd and 4th slots are utterly too low)

CVs take priority over CVLs though since it's the CVs that gain more Air Superiority than CVLs. Just that if Ship Locking happens, you may need to consider using CVLs as well..