I am a fan of the AGM regardless of brand .
I am not an advocate of battery tenders .
They cost money and can lead to overcharging / evaporation issues.
I disconnect the batteries in my boat for all winter .
I disconnect my TT batteries ( fully charged ) after every trip .
They stay fully charged through the winter freeze ups .
My friends have lost batteries due to cracking / freezing because they lost their charge over the winter .
I have gone to AGM ( over time ) in everything because of the low cost Exide EDGE available from BiMart .