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You know, there is no law saying you can't use both. Use Slick to get the paint clean (I use it to detail the wheels too) and then after it is good and clean and slickery (Heather's word not mine) hit it with some Hydro for your "Depth".
I wish someone would do a double-blind test on wax and QD. Betcha a Big Red soda that very few could guess the Zaino side v Epic or Hydro side v Slick.
I do both often, now that Clara is garaged at night. There are lots of times where I use Slick just to get the surface dust off (or spot-clean for bugs, lately...grr!), and then do an all-over Hydro. It's like a waterless car wash!