I voted AKL. My 6 year old DD is sitting right here and I asked her. She preferred the AKL slide...said it was taller (not sure that is true, although I think so.)
Also, I liked that I could park myself right at the stair entrance to the slide and watch her go up the steps and down the slide over and over again, all from where I was sitting. There was a nice shady area with lounge chairs (although you may prefer sunshine..I like to shield my skin from the sun as I have done enough damage already, LOL.)