I don't know those brands ... and actually am not here to talk about "chargers". I do want to say a few words about the batteries, though.
There are two kinds of batteries used on fishing boats: Starting batteries and marine batteries.
Starting batteries are design for one thing, a fast dump of current through a starter motor to turn the engine over. They have thinner plates and can withstand larger temperature differences as quick discharge/recharge cycles occur.
Built in alternators are designed to also rapidly recharge starting batteries and maintain them. The regulator works to allow over 100 amps of flow when a low battery is connected to it. The regulator also responds directly to resistance through the battery, which increases as it charges, reaching almost an "open circuit" (infinite resistance) when fully charged.
Marine batteries are designed to slowly release current flow over long periods of time. They have thicker plates, which can warp if the heat changes too rapidly.
Battery chargers are MUCH better at recharging these batteries, as maximum amperage is lower (I.E. the above mentioned 4 or 8 amp chargers) They work the same as an alternator, as the battery reaches full charge amperage reduces as resistance rises, but they take a longer time to get a battery to full charge. This prevent the heat build up that can be reached with an alternator's current.
Alternators should be hooked to the starting battery(ies) and all electronics required while running the engine. Marine batteries should be hooked to trolling motors and depth finders ... things used while the engine is off.