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The best size is the size that provides enough gas for the dive that's been planned. That might be a single AL80, or four HP100's, or whatever.
don't do four steel tanks....
I have "intervals" for my primary tanks. I only dive aluminum if I have to fly somewhere, so this is steel-centric
LP50's cave filled are roughly 130cf
LP50's and one stage are roughly 200cf
If I need more than that, I go to HP120's which are 240cf
Pair of those with a stage are roughly 300cf
If I need more than that I go to LP121's which are also roughly 300cf and will have stages with that