I think if you can afford it and when you can wait a couple of days/weeks (it will not take so long now) until it is officially supported, you could buy the Pixel 10.
It gives you the longest updates (whether or not it is graphene or stock android), most modern hardware in the Pixel Lineup, and if you want to sell it the highest price on the second hand market.
If you need it super urgent, then you should pick the 9 or 9a.