[2019] (British) CVs worth grinding?

Ark Royal has a twist - her bombers and torpedo bombers are older than on others T6 carrier - they have hit points and they are slower to their classmates, which is compensated for by the large size of the squadrons and their quicker recovery.

Her bombs also have less penetration, but there are more of them.
So, while she has some notable UK CV features like proper ellipse sizes and level-bombing, going though the line would give you better feel for higher tiered CV.

Also, Kaga, T8 premium, has similar twist - worse planes, but more, much more of them. But of course she's deifferent from Ark Royal - Japanese attack planes have different attach pattern, and other nations use dive bombing instead of level bombing.

Also, IJN researcheable CV's are currently the only ones available using armor penetrating bombs. (They work essentially like AP shells hitting from above and can citadel heavily armored ships)