I have a 15" 2015 MacBook Pro 16GB RAM with 1TB storage... It does not have a discrete graphics card... I bought it pre-owned and it came with Monterey 12.3
Because of my experience with iOS 9 on iPhone 4s, I decided to downgrade it... Using internet recovery, I was able to install High Sierra on it... Pressing the combination keys for the latest supported version, I get Monterey...
I first decided to upgrade to Catalina for it is the last version designed for intel Macs... Big Sur and newer can be installed on intel Macs but they are primarily designed for Apple Silicon...
After testing and switching between High Sierra and Monterey [Catalina got broken and I did not create a bootable flash drive at the time], for some reason, internet recovery can no longer install High Sierra and I get recovery server could not be contacted...
As a last resort, and no bootable flash drive, I decided to go with Monterey... I initially decided not to go past Catalina because Monterey is 12GB download and the install time is way longer than Catalina and older versions...
Launching Monterey Disk Utility on internet recovery gives me the spinning wheel of death which seems to agree with my conclusion of not to use the newer/latest supported version... Monterey seems to boot a little slower than Catalina and High Sierra but after using Monterey for about a month now, it seems to perform okay although at the moment I just use it for AirDrop and web browsing...
As soon as I have the funds fo Final Cut Pro, I will purchase it but for now I will go with iMovie...