Depends on what you're in the mood for. The Wiz books* are a light, breezy read that goes by quickly. If you want more depth and seriousness, then the Honorverse sounds like the thing to try.
Or you could just start both books and switch between them until one of them really draws you in.
* The 5th, unfortunately, was never released in e-edition and the 6th which Cook had planned was sidelined due to his health problems, although he's put up the
unfinished bits online, with some
notes and comments on his blog.