I tested, installed and compared them all.
Most of them look nice, with all the visual bells and whistles, but
they simply are not stable or a pain in the ass to maintain.
This one stands out, as you can easily hide it, it never crashes,
has most features of all of them, and is fully customizable.
Before you shout this is spam > it's 100% freeware, no spyware.
http://www.tranglos.com/free/keynote.html
Try it, you'll love it.