Gudao has more hentai since he's the perfect stand in for the dick in Grand Order hentai, while Gudako has less simply because we don't see much of her or her personality due to her being a semi-"faceless" player character (she still has more personality that Gudao due to the Riyo manga). Essentially, Gudako is but one heroine while Gudao is the gateway to the rest of the heroines.
I would say its Gudao as the hair barely fits, and if they wanted to make it a random male, they would have chosen a more generic haircut that covers the eyes better.
Also, its a damn shame there isn't more Male Protagonist x Female Protagonist art out there, because you just know the body compatibility would be on a whole new level.
Gudao has more hentai since he's the perfect stand in for the dick in Grand Order hentai, while Gudako has less simply because we don't see much of her or her personality due to her being a semi-"faceless" player character (she still has more personality that Gudao due to the Riyo manga). Essentially, Gudako is but one heroine while Gudao is the gateway to the rest of the heroines.
Gudako is superior though. It is as you say, Gudao just loves men and is obsessed with dicks while Gudako is obsessed with gambling and cute girls.