Tough call. Kidani is the most appealing to me aesthetically, but from what I've read, it seems services and amenities are pretty limited right now. IMO, I don't think the pool would necessarily be overrun because the most amount of people staying there is relegated to however many Kidani holds, and I don't think early January will be a sell out. We just returned from CBR and were pleasantly surprised with low to moderate crowd levels at the feature pool. It was noticeably busier around 4pm and later as people returned from the parks, but not uncomfortably so and we always managed to find chairs.
All of that said, we visited Disney Springs 3 times on our 6 day trip, more than we ever usually do on a typical trip. This was because we couldn't park hop and with parks closing early, there was simply nothing else to do in the evenings. Its just DH and I, no kids. The walkways at Disney Springs feel more crowded in the evenings, but stores and restaurants still seem to be adhering to capacity requirements. Being able to walk there from SSR would be a big advantage both as an easy option for something to do in the evenings as well as dining options. Twice I found last minute same day TS availability there at a good time, with good options to choose from.
If you plan to have ample resort time, OKW might be the best choice for that. Its probably the most relaxing and I would expect it to be a toss up between SSR and OKW as to which resort would be the most quiet in the current environment. You'd also still have the benefit of a quick boat ride to Disney Springs (I assume its currently operating).