SwitchResX I think is different. It is superior in a way that it creates additional display modes which macOS then can use as a native resolutions on Intel. On M1 the problem is that it can only create scaled resolutions and even at that cannot create HiDPI resolutions if the display reports itself as sub-4K. This is due to an inherent limitation in the M1 driver implemented by Apple, not the fault of the SwitchResX developer. I was a SwitchResX user for many years on Intel macs and was dumbstruck when after replacing my Intel macs with M1 I found out that I cannot use my displays as I used to.

BetterDummy simply navigates around the whole problem by creating Virtual Displays that are mirrored to the main display. This is in one regard inferior, since this is inherently a workaround but on the other hand can work on-the-fly and all possible resolutions are instantly available and accessible via System Preferences/Displays.

This is how I got hiDPI to work with a 1440P monitor https://github.com/bbhardin/A-Guide-to-MacOS-Scaled-Resoluti...