Optima, Gel or AGM, Advertised as both, which is it?

Here's my shot: 300 cycles. 80% DOD depth of discharge, 20% remaining. Immediate and full recharge after discharge. What is the remaining 20 A/H capacity of a group 31 yellowtop after such an exercise? In other words, at what ampere hour capacity number would be expected as being "minimum" by OEM?

Sixty percent discharge, 40% remaining, same parameters?

Fully recharge the battery, then conduct a 20 A/H capacity test. Numbers?