Throughout the series, they have been supportive roles to the main villains/antagonists that have been funny, annoying, witful, and generally entertaining.
For a refresher, here is a list: https://dragonball.fandom.com/wiki/List_of_henchmen
If we are to include Vegeta, I think he would win for most people but I feel like he branched out to be his own villain (and later hero) early on so I don't count him even though he is listed as one of Frieza's henchmen. I mean, he had his own in Nappa so excluding Vegeta, who would you say is your favorite?
For a refresher, here is a list: https://dragonball.fandom.com/wiki/List_of_henchmen
If we are to include Vegeta, I think he would win for most people but I feel like he branched out to be his own villain (and later hero) early on so I don't count him even though he is listed as one of Frieza's henchmen. I mean, he had his own in Nappa so excluding Vegeta, who would you say is your favorite?