Stone plains hill has got to be the best. One underrated advantage of a 3h city square is if your food is crappy you can just go settler from pop 1 after the worker and get it reasonably fast while you wait for your worker to improve your mediocre food tiles.
like, take this start:
1: settle on stone hill
11: worker
16: worker improves a plains deer or a dry wheat or something.
23: worker farms a flood plains or something.
25: first settler is done.
31: grow to size 2.
35: grow to size 3.
Compare it to an ordinary wet corn start:
0: settle in place
15: worker
19: improve the wet corn.
21: grow to size 2
24: mine or something
25: grow to size 3
29: another mine
35: first settler is done.
so both starts have 2 cities with a pop 3 cap by turn 35, but the stone start got their settler out ten turns sooner and has a lot more hammers which could have gone into warriors for fogbusting or maybe a granary, plus extra worker turns from the worker coming sooner. Plus, wonders. I think stone plains hill wins out easily as the better tile.