Highmane is very good in hunter because its a pain to kill and even if you do, it spawns beasts in which you can easily synergize with hound master, kill command, etc.
Piloted Sky Golem is even stickier that Highmane because 4 drops in this game are insane but its not played in Hunter because it lacks beast synergy and not played in most other decks because 6 drops is a highly contested spot.
Tbh I actually think that a while ago (when the Feign Death Control Hunter was run) people ran 2 Highmanes & 1 sky golem. In the current metagame that archetype hardly exists because it seems too slow. highmane is arguably a better card so people dropped the sky golem (for stuff like Dr. Boom in the current Midrange). However, since it seems you are having plenty of experience with it, who am I to critique. If you feel running them 1-1 then that's the way to go ;)
Actually that deck-style still works. My version has just been modified to slow the opponent down too via secrets ;) I linked the deck too for reference.
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I run double sky golem and one highmane in my list because, well, it's more fun and a feign death list is meant to be fun to play. Highmane is probably better overall, just because of the health bonus.
I would run two [card]Savannah Highmane[/card] in most of my decks if that card was neutral. A 6/5 is way better than 6/4 and two 2/2s is usually better than what I was getting from my [card]Piloted Sky Golem[/card] There have been nerf requests to make [card]Savannah Highmane[/card] a 6/4 since he's that good.