That is a seriously unbalanced roster.
Finalizer is your most viable capital ship for the time being but while it is good on offense it wont do so well on defense.
Looks like your guild is doing DS Geo TB so you should be putting all of that GET2 currency into your next capital ship. Malevolence is viable offensively at 5 stars even with modestly geared Geos but you will need Hyena bomber starred up as much as possible and again it is not so good on defense.
Those are the two fleets I would focus on. The good news is that you are not going to need to invest much gear in those pilots to get the fleets up and running.