rhimbo I really don't see much difference between them other than differences in nits, pixel density, some difference in megapixel resolution of cameras, software zoom (7x versus 20x), etc....
Indeed, plus Gemini is the Nano version on the 9a. ; ) I got it for price and features that fit my needs. My U.S. model has a nano SIM slot.
rhimbo One curiosity is that on store.google.com the Pixel 9s are more expensive than the Pixel 10s...
The 9a is under $500 on Amazon. I'm not a heavy phone user but I'll bet most average users would be happy with the 9a.