The only people that would truly get any advantage with an AGM vs typical lead starting battery, would be those that operate with items needing a large battery draw. Such as snow plows, winches, night time off road lights, having an inverter installed for 110 use.... Being as AGMs can generally speaking handle more than 5-6 total discharges like a lead starting battery. Your chances of buying batteries prematurely lesson.
Like ALL things great and small, when we have more than one option, there are pluses and minuses to all the options. So depending upon the individual plus/minus, how they fit your individual needs, one can come up with a which is better.
Last fall buying a battery for my 1500, the lead bats had a upwards of double warranty lifetime, more cranking amps, both maintenance free......no AGM s in stock. Simple choice in my book. I was thinking about AGMs for some of the reasons I mentioned
Marty