The key to long term survival anywhere in the ZA is to establish secure communities and start producing food and as much other stuff as possible. It doesn’t matter how secure your place is if you starve to death.
If you remove outright predators like Negan, the Claimers and the Governor, any one of the places we've seen might do. The prison was great, but so are Alexandria, the Kingdom and the Hilltop. Alexandria even has electricity and running water at this point.
Woodbury might have worked but for its crazy leader. Terminus had a little horticulture going on but was subsisting on cannibalism. The farm proved unsafe in the long run.
Celia had a thriving community but all those walkers on the place made a catastrophe waiting to happen.
The ranch was thriving too but its racist policies would always cause conflict with other people. I would be concerned about water if there was a drought but that may because I'm an easterner accustomed to green forest, not desert.
The campground was clearly unsafe. Madison's neighbourhood had nothing to offer, IMO. I don't think that the middle of a large city would be good in any case. The hospital was defensible and provided medical care but how many people could you feed from that little rooftop garden? What future was there for such a small group in such a limited space?
I would never go to the slavery and violence based Sanctuary, which will eventually implode anyway. I don't think it should be lumped in with Alexandria, the Hilltop or the Kingdom in the poll because it is nothing like them.
So I'd choose one of the prison, the Hilltop or Kingdom, and most probably Alexandria for its comforts.