For strategically defending islands or landing zones, destroyers are ideal. 3+3+3. They are also versatile in the fact that they tactically defend on 3+3+3 as well.
For invading or fighting any other forced battle, carriers are perhaps best, 3+4+4. For strategically defending a sea zone however, you only get 1+3+3. The planes can be switched to support ground combat of course, which is very useful, as a portion of your naval strength can be used on the mainland for an attack, and still fly back to your carrier and deter a tactical attack on your fleet.
Also, against a player relying primarily on aircraft to control the water, CVs are preferable.
SSs are too vunerable to air attack IMO. I dislike using them to any large extent. I use them to soak hits if anything, grouping them with BBs.
I feel that one thing that has been missed is the BB’s reusability. Use along with planes or some subs to attack and to soak up one hit, then retreat. Since UK’s fleet is always split, this can be very useful against convoys as Germany (attack from the Mediterranean outwards). If UK keeps its fleet together… then either invade UK or take all its cash!