Linda -
I've found that the liquid version of a product is better if your paint has tar, bug or other surface crud. Seems to remove them with less effort than paste wax. If the paint is free of contamination then paste wax *might* be better - but maybe not enuf to matter.
There are several good products/brands out there. Everyone has their favorite. It can depend on the exact vehicle and paint color. In other words, what works on my T.Bronze may not be the best for your X.
Application and removal should not require a lot of effort. Water should bead for 3 months or more. If a product does not satisfy these simple requirements, try another.

dave and xtoy - we have a shelf full