If you prep the finish to it's natural highest gloss either protectant will give you all the pleasant features (depth, gloss, reflectivity, wetness) one normally desires. If you want to change or alter the color hue (darken) and mute some of the reflectivity for a more apparent warmth, a carnuaba will do this for you. If you desire the just detailed look beyond the 1st wash, a good true sealant will meet your needs.
Though I do not recommend AIO, even though it appears to work fine, I would definitely at least do a Z6 wipedown prior to applying Zaino or the QD of your choosen sealant.
On silver metallic it is hard to make the wrong decision. :xyxthumbs