question on a 90 amp vs 120 amp alternator

my68barracuda said

I have a 90 amp alternator in there now, and the scenario that you mentioned, everything in the car running and stuck in an idle situation is what I am thinking about. That is why I was considering picking up a 120 amp alternator probably at a pull a part,, but only if that would help a idle rpm’s

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I never in my life have paid more than $40 for a reconditioned battery LOL... I just had had enough of it and thought I'm going to buy a bigger alternator which for me that was a 90 AMP and I figured a red top battery at first but then as I got to reading about the yellow top being a hybrid with deep cycling capability I figured that out of keep everything running while it's idling for a few minutes until I can get going and get it charged back up. So far so good...