A 24 case regular lead/acid battery is really all you need unless you are using the battery to run an electric trolling motor. Deep cycle's are made to be drawn down low and then recharged. If you use them like a regular battery where it's almost always topped off by the generator / alternator you will actually shorten the life of the deep cycle. So what type of battery you get depends on it's usage. But for regular marine use a 24 case lead/acid (regular) battery is the way to go. Look for the ones that have the most CCA's (Cold Cranking Amps) or MCA's (Marine Cranking Amps). The higher the number the better (and usually more expensive) the battery. I like Exide and Interstate batteries, but just to show that nothing is forever I bought a new Exide for my Jeep last year and it failed after about 6 months of use. Of course it was under warranty so it got replaced, but the point is that no brand is 100% guaranteed to be perfect all the time.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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