I started out fitting push-pulls thus:
Volume - add neck to bridge, and by extension enable all three pickups in parallel
Middle tone - phase invert the middle pickup
Second (bridge) tone - coil split the bridge.
My logic here was that the functions controlled by the push-pulls mimicked the order of the pickups.
After fitting push-pulls, then figuring out I for one, couldn't get a decent enough grip on Strat shaped knobs to pull on them, I switched to push-pushes.
I eventually wired my HSS strat with an auto coil split in P2, and wired the second tone pot as a blender for the neck. The push-push remains to phase flip the middle, however.
On my SSS Strat the first (middle) tone phase flips the middle and the second tone is wired as a blender as well.
On my HH Strat I wired it for two independent volumes and a master tone. I used a 5-way Superswitch to give auto coil splits in P2 and P4. So far I've left P3 as both humbuckers, both coils, in parallel. I might have a tinker and change the second tone pot to be a push-push for a series / parallel in P3. Haven't decided on that yet and haven't designed the wiring for that either, however.