Above are series of novels, adventures, about British naval officers in the late 18th and early 19th centuries. C.D. Forrester's Hornblower is more action packed, originally written for adolescent boys, and O'Brian's Aubrey-Maturin series is more cerebral, more immersive in the humdrum of quotidian life at sea in a sailing ship, though interspersed with battles and intrigue.
I like them both a lot, although in my case I prefer O'Brian.
I think, from my reading, Kent's Bolithio is probably more like Forrester's Hornblower, but I like a good ripping adventure yarn, too. (Sort of like while I prefer Sir Arthur Conan Doyle, I enjoy Robert B. Parker.)