I never have used an AGM battery in any of my daily drivers or my backups, but I have used one in my old restomod '69 C-10, then another in my '66 Chevelle ( while it was still streetable, before having to use dual batteries with the big block drag race engines). I also tried a Gel battery, but fried it recharging between rounds.

I found that STD lead acid batteries were better when no alternator was used, and dual batteries were quik-charged several times a race day.

But, currently I've been using an Optima Yellowtop AGM in my home-built trailer for 12v power off grid since 2012. I charge it constantly whenever at home in the garage, or when camping at state parks, using a desulfating maintainer. Good battery.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide