First of all, congrats on the acceptances!
Generally, I would say that you couldn't really go wrong with any of those choices, though of course research overlap is an important factor, and that's something you'll want to figure out just by digging deeper into the specific work being put out by your potential committee members. Without considering your situation in that regard, though, I would go with Stanford. Personally, I think Tanya Luhrmann is one of the best in the business, and it would be massively cool to work with her. You'd also be in good hands med anth-wise with Angela Garcia. I am not very familiar with the med anth folks at UofT and Chicago (though you might want to check out faculty in Chicago's Comparative Human Develoment program, with whom you could potentially work). The Bay Area, while expensive, is generally a really pleasant place to be, so quality of life wouldn't be a problem (I am a Californian, and have reservations of relocating to a bitterly cold part of the continent - a decision that I myself may have to consider). Good luck with your decision!
And while I'm here, I'll throw out a question of my own to the thread: how dissuaded should I be by a program/university that is not very well-represented at all in terms of work being done in my geographic target area? A potential university is -really- strong when it comes to one of my main research areas, but not country-specific scholarship in the place where I would likely be carrying out fieldwork. I am open to potentially pivoting to another country, but this still is a little concerning. What do people think?