The HH can you can go with all 500k pots for the humbuckers. Lose the straty sounds of the positions 2 and 4.
The HSH, you get the kind of straty sounds in positions 2 and 4. Not as clear if we choose 250k or 500k pots here.
SSH I assume you mean, where the humbucker is in the bridge. Its a compromise if you use 250k pots, but some humbuckers worth fine with 250k. Can use 500k pots and just have 500k resistors switch in parallel when you use the single coils.
My choice would be SSH, then HH, then HSH. I have a couple of strats with the SSH configuration. When you split the humbucker, you can still pretend you have a SSS strat which is nice. You also still have the neck/middle combo which is nice. I find this the best of both worlds between having all humbuckers in a strat and all single coils.