If you fish 24s will be fine. If you tournament fish 27s or 29s. Tournament fishing isn't for fun and $$$ is on the line so you must have staying power for the entire tournament.
As with any battery's, get a charger designed for the type battery your going to use and charge them fully as soon as possible. I push the boat in the garage and hook the battery charger up, then get a beer!
I've use Delco for years. The worst things for battery's are not fully charging them, over charging them, drawing them down to far, parasitic draw and leaving them undercharged .