Hi Zubair
This is one of my favorite topics, carnauba wax!! 1st off, I do not like the Hybrid waxes as to me...they are missing some of the wet look and depth. I tried 2 very well known hybrids and donated them to AGO members.
As for carnauba waxes, I do believe it cannot be 100% pure. There will be an ingredient or 2 to make the wax pliable as carnauba wax is very hard.
That being said, IMO Pinnacle Souveran is a great wax. I have used Dodo Juice Supernatural wax too. Both are excellent! As for the P21S 100% Carnauba, I cannot comment as I have not used it before, HOWEVER, Santa sent me a jar. Just waiting for it from AGO shipping.
Either way, IMO you can't go wrong with the 3 you mentioned. As for longevity my assumption is that they will not last as long as a hybrid or sealant but who cares!!! I enjoy waxing so it does not matter.
But to get the best wet look, gloss, and depth you cannot beat a good carnauba wax.