IMO, it would be best to go with METAL graphics rather than GL2 at this point (on Macs). Apple has deprecated, but still supports, GL2 but I don’t know for how much longer. Conversely, GL2 still seems well supported on Windows computers, AFAIK.
HOWEVER, yes, CPU is the most compatible. There was a fix for the CPU issue that was brought up in this thread: https://iplug2.discourse.group/t/is-igraphics-cpu-the-most-compatible-graphics-option/719
I tried it and it worked for me.
BTW - I actually prefer the less recommended NANOVG over SKIA for bitmaps. It seems to render sharper images, especially when resized with the corner resizer function. It has a size limit on bitmaps but it’s usually plenty for plugins. Drawback is you can’t use NANO with “CPU” only SKIA. So you have to make some choices…