Hogger is weaker. 4/4 is much easier to deal with, and you almost never see him summoning two gnolls. Even in the scenario he does, I would still go highmane. Hogger has to survive three turns for him to be comparable, which is unrealistic.
Illidan. 7/5, summon 2/1 every time you play a card. Illidan is better than Highmane in most scenarios, as you can get out the 2/1 immediately, and he has one more damage point.
The Beast Ray Ban 1065 is a 9/7, but with a shit deathrattle. He is much easier to deal with, and you often only need to trade 2 1 or 1 1 if you lucky, and he even gives your opponent a 3/3 to boot.
The Black Knight. Situational considering taunts are not all that popular. 4/5 is not really all that good for a 6 drop. Wouldn pick over Highmane.
Avenging Wrath is hard to compare. It a spell, and does something completely different. That being said, I would probably pick highmane over Avengig wrath.
Cabal shadow priest is 4/5, which are poor stats, and takes over a creature which will in almost all cases not be comparable to the two hyena Would not pick over highmane.
Force of nature. Three 2/2 that die at end Replica Ray Ban Sunglasses of turn. 6/6 in total stats, compared to 10/9 that highmane offers. Clearly worse.
Kidnapper is 6 for a 5/3, with a sap battlecry http://www.cheapsunglassesstore.co.uk/ray-ban-sunglasses35/ray-ban-13638 if you combo it. Horrible card.
Cairne Bloodhoof. Cairne has less attack but summons a slightly stronger creature. About as strong as www.cheapsunglassesstore.co.uk/ray-ban-sunglasses35/ray-ban-3137 highmane.
So here we have Illidan clearly outclassing Higmane in my opinion, with Cairne being about the same strength. Hogger and Cabal Shadow priest (and also The Black Knight, situationally) come close, but don perform as well.