even if you dive nitrox but as you had air you will feel better after the dive with the nitrox.
Because your body will not be tired as it would be with air.
Take the extra NDL time to aside, just for knowing that nitrox is better for your body makes it a better choice.
Anyone who tells you this and dives nitrox on their 25' dives at the quarry is smoking better stuff than I can find. It's a placebo effect at best and people looking to justify their green and yellow stickers and added costs.
Nitrox is a deep gas. Nitrox is anything over 21%. I regularly dive 25% to depths of 150-160' and 50% to deco on (also a nitrox mix). That, however, requires a whole new set of much tougher classes to qualify you.