For myself, I prefer the Honor series though mileage will obviously vary. I've read all of those. One of these days though, I'll have to revisit and finish the Seafort series as I only got up to Fisherman's Hope which I got when it first came out. One of the reasons I prefer the Honorverse series is that it is a little more upbeat than Seafort. Seafort always seemed too intent on punishing himself (rightly or wrongly). However, late books in the Honorverse series do get rather dense and "expositiony" which puts some people off. So far though, when the new one comes out, it usually goes on the next to read pile.