I've used Acura, Honda, and indie shops for my Acura's over the years. Earlier in my career when money was tighter, I would go to dealers only for oil changes (so I get the "free" inspect and find everything possibly wrong multipoint) and have an indie mechanic do any substantial repairs for much less.
Other than the Acura dealer requirement for warranty work, and the chance that some Acura-only parts might not be stocked at a Honda dealer, I don't see much of a difference between Honda/Acura dealers other than Acura tending to up the "extras"' a bit in the service experience, and their higher price.
Later in my career I tend to value some of the Acura dealer timesaving items more (drop off / pick up / conference rooms / loaners / etc) vs the repair cost differential. Plus I have 9-year CPO warranties on two out of my 3 Acuras so have built relationships at the dealer since I have to go there for CPO repairs. My local SA makes it easy (call / text / email them individually to set up appointments), they add extras in service (eg: buff out finish dings every oil change), and they go to bat for me with Acura justifying warranty coverage of stuff. Dealers are expensive, especially if you don't have a good sense of when you are being upsold a repair, but a long-term CPO goes a long way towards protecting against upsells and getting pricing that includes Honda's warranty-reduced discount on the hourly repair rate.
I'm sure I could save tons of money doing my own maintenance, but I'm at the stage of my life where every weekend/vacation minute with my kids is precious before they leave off to college, so I much prefer teleworking from an Acura conference room and not losing a work day, vs spending hours wrenching on a weekend away from my family. I'm not even sure teaching my kids to wrench is all that valuable with the coming migration from ICE to EV's.