Whatever is the best bang for your buck. I've used several different ones, they work the same. It comes to cost and dilution ratio.
No need to use distilled water either.
It won't flash with the liquid added to the spray. Making the spray harder to use and probably taking the durability of the liquid away.
But you should try it anyways!
If that is what you mean, I'll save Mike the trouble of linking his well written article on it!
http://www.autogeekonline.net/forum/hot-topics-frequently-asked-questions/23263-difference-between-cleaner-wax-finishing-wax.html