I've got two primary diapers right now for different purposes. My regular diaper is the Rearz little monsters, and for working out the European Tena Maxi (old discontinued model) plastic backed for less chafing and better movement. When I eventually run out of the Tenas, I've already settled on Bambino Bianco to fill that need.
With the capacity wars in the abdl space, I no longer need boosters or an exclusive overnight diaper - my daily diaper is often changed long before capacity is reached. Wearing a "thin" or discrete diaper isn't important to me and hasn't been an issue, rather knowing that leaks won't be an issue and diaper changes aren't needed every 5 minutes is the priority. The thinner and less absorbent workout diaper is also handy when I know I'm going to only wear it for a shorter period before getting into a fresh one (think getting ready for night on the town or bathing) where it feels wasteful in money and capacity that isn't needed for the shorter period. When it comes to ISO ratings, anything above 4500 ml trends to be enough (again, every diaper works and fits differently), and I've found that the crazy 8000+ ml rated diapers are actually more prone to leaking on my body! I don't want to be in the same diaper for 24+ hours, the bulk can be uncomfortable and ammonia buildup can be an issue. 3-5 diaper changes per day is my comfort zone and good quality disposable diapers lock wetness away where it's comfortable for long periods and not prone to skin irritation or rash. My diapers are wet to some degree 90% of the time, and I certainly don't want to be changing diapers every 5 minutes...
I do frequently try bags and cases of other diapers to see if I like them better - so technically I've got a lot more diapers to choose from as the mood strikes. I'm often wearing other brands and styles to keep things more fun and interesting, not to mention finding diapers that work better for me! It's also good with the supply chain issues to have known good backups to order if / when my regular ones are not available. Unfortunately sometimes that means finding out they don't work so well on me too - so those eventually get used up when I can safely fit them into my routine - I don't like the idea of wasting unused product if I can avoid it, but even that aspirational mentality has it's limits...
Unfortunately my previous favorite daily diaper is no longer produced - so the search for a replacemenr that I'm comfortable with has been at the forefront over the past year. Although I've found one in the little monsters, I'd go back to the previous in a heartbeat if it unexpectedly came back... Different diapers fit and work differently, and getting accustomed to them doesn't happen with just a sample of one or two!
Also, it's more fun and engaging to have a choice of prints and styles to fit a mood or need! It seems most that are regularly wearing protection have found that having a variety can be beneficial!