When it comes to QD's over carnauba, just about everything will do just fine. If it's an otc QD you're looking for you can't go wrong with Mother's Showtime & Meg's #34. However, I am partial to Sonus Carnauba Spritz & Pinnacle Crystal Mist. Both contain some carnauba. I just love the Crystal Mist. I use a 50/50 mixture of Carnauba Spritz & Crystal Mist with great results. ( "Crystal Spritz" ) I'm taking the advice of Scottwax & ordering up some CK QuickShine. He swears by it. Last month I ordered some PB Spray & Gloss in the 32oz. bottle. That's a nice product as well. It leaves a nice gloss.
To me, It all depends on what you use your QD for. For instance, I use Mother's Showtime or Meg's #34 after washes to remove water spots. I then go back over my truck with my "Crystal Spritz" to replenish the carnauba & to deepen the paint a bit. I also only use QD's after I wash & after I wax. I find that QD'ing my unwashed black truck produces marring. Better to be safe then sorry.