What I've read about AGM they Last longer due to the plates are separated by glass material so they don't get corroded like, lead acid batteries plates floating in water, so I'm guessing in theory they should be safer from rare explosions if the pos and neg plates are kept separated ???? Course the cost is more. Depends on how long you want battery to last if the extra money worth it. But, even then, no garrentee it will last longer.
I would be more concerned about disconnecting and reconnecting the batteries in proper sequence. A spark or jump in voltage can play havoc with computer circuits on car now days. When I replace battery I try to get the highest CCA battery that will fit my car based on size of my battery box and position of the pos and neg terminals. Some time this involves altering the battery hold down bracket. But, that's me.
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