The best replacement for agm battery is gel.

The best alternatives to agm battery are rated as following:
★★★★★  gel
★★★  lead acid
★★★  sla
★  lead acid battery
★  gel battery
★  flooded
★  gel cell

Your alternative for agm battery is not listed? Suggest!
Speaking about agm battery, one probably shouldn't forget about battery tender.

Other search terms related to agm battery and their ratings are:
★★★★★ battery tender
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Google Trends

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agm battery
gel
lead acid