Should I buy Pixel 9 Pro or 10A for a long term usage?

I'm currently looking to switch from my iPhone XS that I hate to a Pixel phone. My budget is 550-600$.

I've used a bit of Pixel 3 and really liked it.

My main question is: What phone should I buy for a long term usage (3 years or more)? Before that I used to use Realme 8i for around 4 years and went to iPhone XS. I don't game on my phone and don't take videos. Mainly I use my phone to watch YouTube/anime/twitch, listen music on Spotify, look through Pinterest and read manga/books. Sometimes I use multitasking like floating window on YT. Which of those phones should I go for and why?

Mainly I was going to buy 10A, but 9 Pro has 12 and 16 gigs version which to me look more favorable than 8 gigs of 10A, but I wanna hear your opinion cuz i'm not really experienced with Pixel phones since they're not really popular where I live