I'm sure I am one of those that commented on Slick Mist in other threads because I am very high on it. I can not find AquaWax in any store near me so started using the Lucas and I have been very happy with it. NAPA is suppose to carry it but our store does not. Lucas on the other hand is carried everywhere, including Walmart, and is priced a little lower than AquaWax which makes it a true bargain.
I use Slick Mist in much the same way as AquaWax, ie, as a drying aid. It goes on smoothly and leaves a good shine. I do not believe it protects as long as does AquaWax but since I use it so often it makes no difference. I am looking for ease of application and shine only and in this respect it is as good as any of them. It is also very versatile, as is AquaWax. By that I mean you can use it on glass and even on interior vinyl (although I prefer 303 for that). I don't know a place on the car that Slick Mist can't be used. It is also a good "topper" when the car is dry and clean. And the strong bubble gum smell is a very nice bonus.
If I had to have only one of these I would probably stick with AquaWax because I often use it in conjunction with Duragloss 111 and 105 sealants. Other than that, I think it is a toss up with a slight edge to Lucas because it is available to me locally whereas AquaWax has to be ordered.