How they compare
Both are run by Gamma, but they're aimed at different viewers.
Adult Time is the big bundle: dozens of studios, including Pure Taboo and VR, in one membership, the closest thing to a porn streaming service, at $19.95 a month or $143.40 a year to stream at the time of writing.
Playboy TV is Playboy's adult channel online: original erotic series, reality shows and specials with Playmates and models, closer to erotic television than hardcore porn. Streaming costs $19.95 a month, $29.95 with downloads, or $119.40 a year. Both sell short trials that renew at full price, so check the terms.