I`m gonna have to agree and disagree with your post, Bob.
I agree that prep is (easily) the most important step...BUT from a chemistry standpoint something like PA High Gloss is literally just better. Titanium/titania- whatever- in a sprayable form = ridiculousness
I`ve used some pretty pricey stuff myself. High Gloss and Zirkon are easily the best sprays I have and I`d put them up against my fanciest paste`s any day (like synergy, black ice, dodo hybrid nano, supernatural)
In the past few yearss my car has had PBL v1, Gyeon cure, Reload, EVERY Nattys wax layerd on itself, Essence, Black Ice, Synergy, PBL coating booster, DoDo Supernatural, Hybrid Nano, Blue Crush, Purple Haze and Double Wax (and I`m probably forgetting a few products)
maybe I`m becoming a fanboy or something but I really like High Gloss and Zirkon -- hell, my SRT has half a 200ml bottle of High Gloss on it- (hides in shame)
the shine from Zirkon and High Gloss are (at least to my eyes- which control my wallet-lol) a step above
once I get the rest of the products I`m ordering I`ll be doing some side by side testing on a few vehicles - mainly to test durability as testing durability on anything on one of my vehicles is essentially useless. I polished off PBLv1 at 367 days out of sheer boredom