IMHO go for a AGM battery with a great warranty. It's more of a hassle to go through a niche AGM battery specifically designed for something like car audio in the event of a warranty issue. I've had Sears Diehard Platinums in all my car audio builds and have seen a SIGNIFICANT, tangible, non-biased improvement in every car I've put them in over wet cell batteries. I have seen a few optima batteries die or have problems at car meets.
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Try things once to see how it feels. Try things a second time to make sure you didn't like it 
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