I'm not too big on Frieza coming back myself to be honest, I just feel like the character is overused. He already got an arc not long ago (with a movie to boot) and was already used a few times in filler/movies so we've kind of had enough of him IMO.
If Toriyama was insistent on bringing a bad guy back I'd take Cell or even Dr. Gero.
If Toriyama was insistent on bringing a bad guy back I'd take Cell or even Dr. Gero.