I have both in my pool. Borates added last year, then added salt this winter when I installed the SWG. Borates improved water feel, salt improved it further. It's just getting to be the first swim season with the salt in, I'll get some opinions tonight. We both love it.
Last year we added borates to the pool per TFP instructions and really liked it.
This year we had some pockets of algae on the pool bottom, but did not have the green water as in previous years, like when we opened it in June last year when the hot weather was already here.
This weekend we added 4 bags of 40# Morton Solar salt. The kids stirred it up and it dissolved in less than an hour. Today the water feels nice, warm, soft, and looks sparkly. Not sure if the salt had anything to do with it, but I know following BBB guidelines had everything to do with it.