It all depends on what you are looking for -
I'm of the opinion that using QDs to do general cleaning of your car is very risky business - especially if you have dark colored paint as you do (black). I would recommend not over-using QDs for cleaning purposes and only using them for birdbombs or other spot cleaning issues that will damage the paint if not taken care of immediately. If you use QDs frequently for general cleaning on a black truck you are going to end up with a big mess of swirl marks, marring.
Stick to a conventional two bucket wash method for general cleaning.
Having said that - if you want a true cleaning QD then use Poor Boys Spray and Wipe or Werkstatt Quick Wash. These are more QDs on steroids that do an excellent job of cleaning, provide better lubrication than most QDs (less risk of marring), and should not interfere with or impair P21S in any way.
If, on the other hand, you are just looking for something to boost appearance and slickness on top of the P21S after washing, I would highly recommend either Pinnacle Souveran Liquid Spray Wax, Duragloss Aqua Wax (AW), or Optimum Car Wax. All of these are an absolute breeze to apply after washing - they go on and off just like a QD and are noticeably better in terms of appearance, slickness and durability than any QD (they each have good enough durability to use as a stand alone LSP). Any of them would look stellar on top of P21S and would give a much better appearance boost than a QD.