I suppose any power method is satisfactory, but there is a downside if there isn't an "instant kill" switch of some sort. I have a friend who had a hangar winch to pull his T210 in, and apparently the overhead door wasn't up quite all the way. He saw that the tail wouldn't clear, but the winch didn't stop instantly. By the time the winch stopped, he'd done thousands of dollars of damage to his airplane's tail and the door.
When I was at OSH last summer, I looked at the Lindbergh tugs (the video I posted above), and they are all equipped with kill switches which stop movement instantly. They have twist-grip "throttles" which allow speeds from 0 to 2 mph, which is nice and smooth, but the "instant kill" button impressed me.
I'll be talking with the sales gal for Lindbergh this week--about to bite the bullet to get one--must be getting old.
Cary