Everyone likes to buy a brand but read the specs before buying anything. Cram as many amp hours as possible into the battery compartment. Group 27 batterys are better than the stupid little group 24s the builders usually install.
If space allows, get a pair of group 31s, a single 4D, or even an 8D if there is room.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp
40+ night per year overnighter
2007 Alpenlite 34RLR
2006 Chevy 3500 LT, CC,LB 6.6L Diesel
Ham Radio: VP9KL, IRLP node 7995