Horses for courses i suppose. Here are a couple of thoughts though:
1) The Fogger is an original device whereas the kayfun lite that you are getting is a clone i assume?
2) The Fogger has a lot of improvements. I have the v4.3 or whatever it's called (has 4.1 written on the side), it was the one before the v5 and have no flooding issues with it.
3) The Kayfuns are known to be easy to build on although having never used one. I don't find the fogger too hard tbh.