Orangs are more closely related to Gigantopithecus which was a ten foot tall ape. I think humans are far more closely related based on the reported sightings which tend to indicate they have a very human face and generally overall body structure, just on a gigantic scale. Mountain Gorillas would be closer than lowland IMO.

Yeti is the closest . I do not know if they will cross or if they are comparable . I suppose an F1 would be called a yet foot . Here it is .

None. Orangutans look more like "Bigfoot" than gorillas. Neither walk upright, but orangs move through the trees by their arms positioned upright so they could be mistaken for walking.

King Kong: They both share in their most obvious aspects.

People might say he doesn't exist but that's not really what I'm asking, I'm asking of any gorillas living today, which type would you assume comes the closest to genetically resembling Bigfoot?