Decisions on this sort of thing depend upon local logistics. What mixes are available to you? How much does it cost? I thought the situation I was in for a couple of months might illustrate some of this.
I did a number of recreational dives that maxed out at around 60 feet, done off a boat that gave about a 45 minute surface interval and a maximum time allowed at depth of one hour per dive. The dive shop where I got my fills offered a maximum of 36% because of their banking procedure, with no difference in price for any nitrox mix, so that is generally what I used. With a fill card, the price was not much more than air. I also got plenty of gas in each cylinder, so I surfaced at one hour exactly on each dive.
I could have done those dives on 32% and been fine, although the second dive would have been pushing up against the NDL at the end of 60 minutes. With 36%, when I reached safety stop depth, my Surf GF was usually about 50, often less. (For those who don't know, the Surf GF is a computer feature that tells you roughly how close you would be on a percentage basis to the limit if you surfaced at that point.) One time it was close to 40. That means I was not remotely close to NDLs. My buddies (also on EANx 36) had computers that did 3 minute safety stops, so I did those stops with them, even though they were obviously not needed. So, I didn't gain any time, but the decompression stress on my body was probably about the same as if I had done the dives on air at 30 feet. With no difference in price, why not?