Flooded batteries gurgle. The electrolyte migrates. A VRB has immolated electrolyte. Is it an advantage in itself? Which characteristic can be labeled as an advantage? Why?
Battery types are a panoply of compromises. If you add up the pluses then add up the negatives of each type and the pluses of one type greatly outweigh the negatives (we're talking about what each consumer wants in his battery) then that's the battery of choice for them. Not for their neighbor or friend or email buddy. The investigation and the decision has to be performed case by case.
But truth and accuracy are paramount. And electrical measurements are crucial for some applications while other folks could give a damn. The don't give a damn side should not impress their ideas on the other element and vice versa.
I own maybe thirty five thousand dollars in batteries (when they were new). This puts a whole different twist on what is and what is not important. I use my batteries heavily. There are cases where a battery could mean less than a wad of toilet paper to other folks. Again, one segment should not try to influence the other.
With AGM my prime interest is knowing if the accumulator is going to deliver adequate kWh performance over its lifespan. Most AGM proponents have not the slightest clue as to the true capacity of their battery as adjusted for age. They are utterly satisfied with the 30% of the capacity they infrequently utilize yet the battery may have lost 70% of it's capacity. No problemo. They are happy campers. The issue with me is when they publicly huff and puff that they have owned the battery X years and "It is like new".
I have a flaw. I get upset when I encounter disinformation. Please excuse me.