The Deka Intimidator is a fairly budget AGM. it does not really have much higher CCA than a Flooded starting battery and the self discharge is not as low as higher end AGMS. They are really best for when exposure to gasses from charging is undesirable.
In deep cycle usage they did poorly in a test done by practical sailor compared to other AGMS
Thge group 65 is a bit of a weird battery, longer wider and shorter than a group 27 or group 31. Its CCA is a bit higher than one would expect for its weight and capacity. If you have some added height available you could use group 27 or 31 and perhaps get some more capacity and CCA.
AGMs are a bit more petulant in regards to their charging specs, when deeply cycled. They would prefer higher initial amperage. And While all lead acid batteries want to be fully charged ASAP after any signiicant discharge, this is extra true with AGM They will walk down in capacity faster if chronically undercharged, but their lower resistance will mask this for longer.
If gasses from charging are not an issue, I would not really spend the extra $$ on an AGM for a starting battery.
I deeply cycle a Northstar group 27. 90Ah storage capacity and 930CCA. I've got over 700 deep cycles on it, and it has no issues whatsoever cranking my v8 engine depleted 65 of those 90AH in mild temperatures 55f+ even with 700 deep cycles on it. Prompt and full recharges and keeping it as cool as conditions allow, are the key to battery longevity. In a vehicle one is largely dependent on the vehicles voltage regulator, unless they also regularly plug in and top charge.