As an adult, Animal is clearly the one making things work, spending the most time in the ring, selling, etc. As a kid, though, Hawk just came off meaner and cooler.
I remember a match where they were in the ring with Mr. Perfect (might have been a Survivor Series) when Curt hit a move on Hawk, turned around to celebrate, and Hawk no-sold, stood about a foot behind him, and when Curt turned, stuck out his tongue and hissed at him. Curt jumped backwards about three feet, and sold it like Satan had just looked up his skirt. I looked at Hawk and thought, "That's the coolest, baddest man I've ever seen!"
He did that to the Samoan Swat team as well. Threw one into the ropes, bent over for a back drop but instead got caught, lifted up and the Samoan Swat Team guy laid out one of the hardest hitting piledrivers I ever saw on Hawk. Hawk was back on his feet before the SST guy got off his ass.