I've always had major issues with strat bridge tones. Just too thin.
But, I recently picked up a Danocaster Doublecut with Papa George's Hairy 60s and its a whole different world. Is it as big as a LP bridge PU, no, but I dont want that from a strat. It growls a lot more than any other single coil bridge PU that I've ever played while still cleaning up nicely.
SSS for a Strat, but I'm done with Strats for now. I'm currently enjoying HSS Ibanez SAs. Better heel access, lighter, no string trees etc.
Never thought I'd move allegiance, but sometimes prejudices need to be gotten over. I've become a pointy headstock person (not prepared to go as far as a Floyd though).
An HSS Strat is just a frustrating machine. I need all the ergonomic help I can get! It's essentially an upgraded SSS, that hasn't reached its logical conclusion (that heel, aargh!). An SSS is what it is. I can live with that. It has charm.
My second will be an HSS with a Shawbucker. They sound excellent.
(But I agree on the neck heel issue. My current one has a contoured heel. I would almost like to get a Deluxe with a contoured heel and rip out the N3s in favor of Fat '50s and a Shawbucker.)
I'm finding that I like the HH. Position 2 sounds like a Tele, and position 4 sounds like an out of phase Strat. Then of course you have the normal bridge, neck and both pickups together. So, my votes for none of the above.
I prefer SSS I think because getting a humbucker to balance with the single coils has been frustrating. I really like the Lollar Special in the bridge. Roll back the tone knob to ~8, and it handles gain very well without getting shrill.
I have a 96 Strat Plus, as well as a Shawbucker that I just picked up in the last month. I'm loving the Shawbucker and debating selling the Plus or throwing something different into a new pickguard for the Plus.