I keep my tanks filled with 32%ish due to the fact that I may do a shallow shore dive or a deeper boat dives or shore dives so I just like to have what I need for the deepest dive I am certified to do (rec). Now, I cant say I feel better diving the nitrox but I dive air too on some of the same dives I dive nitrox and on repetive dive days I do seem to feel better, but that could also be I am drinking more water, eating better or whatever. One thing that I did not think about in the beginning when I dove nitrox was that while the EAN gives you more bottom time compared to Air at a certain depth, I am still limited to my consumption and it does not to seem to less with EAN than air.LOL exactly I had no idea what he was talking about. I'm not advanced or a tec diver. AND was hoping that someone who actually does beach and spring dives on Nitrox would actually answer. I have asked a few people why nitrox... One agreed with the placebo effect, the other didn't really give me a straight answer he just said because he gets longer bottom time. But dude, we're diving together, I not at a max of 25' and you're only doing a 1 tank dive.
That may not answer your question directly, also air and EAN for me cost wise is about 3 bucks more a fill so I am good with that but when I have to pay $16 for a nitrox fill on a boat or something I may dive air so in my mind the benefit of feeling better is not a huge part of my decision.