Hello, Shaw, welcome. I can only comment on vapor, although I realize you wanted to hear from experience beeks with vapor and fog.
I use varrox, made for OA vapor. Requires only a 12 volt battery. I use a small size car battery for weight reduction. For a hobbyist, 20 hives or less, this method works very well for me. Only takes the varrox 2 1/2 minutes to completely sublimate (vaporize) 2 grams of oxalic acid. I hope this info is helpful.