gabowman,I've the Three bank Pro Charger 15 amps. I would reccomend this one that way you can charged all batteries at once. I believe you do alot of night fishing and when using your starting battery for lights and stuff,if fishing all night then that starting battery will be weak. Another thing if you fish few days in a row the 15 amp will charge you up over night,the smaller amp might be ok if you got the time too wait it out. Anyway hope this help's and have a good one.:D
LittleJohn