I think the Doximity rankings are pretty worthless--everyone agrees on most of the programs for the "top 5 or 6" but after that there's really no consensus. I wouldn't let those rankings factor at all into how I decide between programs. Not in the least. If you're considering academics then going to a "top 5" program certainly gives you a leg up, but once you get past those programs I don't think anyone cares unless you go to a program that's known for being low quality.
Besides, residency is far more about the right fit for you than the name, so I don't get why people felt it necessary to come up with a ranking of residency programs. I know as a medical student I was always wondering "what are the best PM&R programs," and when debating how to rank programs I certainly thought about the name (and wished there was a master-list), but in the end I realized there's no way an accurate master-list of PM&R rankings would ever be made, and it didn't matter anyway since I also realized I needed to go to the program that would best help me be the physiatrist I wanted to be, not go to a program whose name made my ego feel good. (Though, if the same program can accomplish both, then more power to you!)
I don't know anything about Schwab or JFK--I didn't apply to either. I do know UC Davis is very close knit--the residents are extremely happy. Like, what did they eat for breakfast happy. Their sports physician (the aptly named Dr. Davis--at least I assume he's still there) was a fantastic guy to work with. Great physician and great role model who loves his job. If you're interested in sports I'd go there in a heartbeat--outpatient is their main strength, and the sports fellowship is one of the best in the country.
As far as TBI/SCI, they have a combined unit (unless they finally built the new rehab unit), which to me isn't as ideal--I prefer dedicated TBI/SCI rotations. There's certainly an advantage to a combined unit/rotation though. I do think you get decent exposure to TBI and SCI, and you rotate through the outpatient SCI clinics too. I do think UC Davis (like most CA programs) is a bit weaker at inpatient (which they compensate for with their strength in MSK), but you'd still come out well prepared to run an general inpatient unit.
Sacramento gets HOT in the summer. Gotta watch that steering wheel temperature! But the delta breeze at night sure is nice--I think it drops ~20 degrees (sometimes more) overnight. Open up your windows at night, turn on a fan, and you probably don't even need an AC during the day. I stayed with an elderly professor who had a house fan (think of a window box fan on steroids, with ducting going through the attic)--it was loud but sucked in all the cold air at night and even when it was in the 100's outside, it was still nice and cool inside (you shut the windows during the day to keep in the cold air obviously...)