If you want the top of the line agm look at the Northstar battery sold at Prairie Battery in Regina. These are the exact ones Canadian tire and cabela's sell. They arent cheap around $400 each but prairie offers a 4 year free replacement warranty the other places only 3 year. Ive heard they are the best.
Only thing to consider is your battery charger and can it charge both batteries. Mine i can switch from wet or agm.