If it wasn't for the trim staining and dust collection, Blitz would be my favorite. The other problem I have with it is that it hazes a day or two after I apply, no matter what I do and believe me, I've tried 10 different ways to apply, buff, cure, re buff, lay out in the sun, etc.
S100 gives you a bit better shine, lets say 10% (total guess) at least on my black paint. Durability seems to be not as good as Blitz however.
If you wax every 3-4 weeks, S100 hands down. If you need to tuck away your car for the winter and won't get many opportunities to wax, I'd say Blitz.
I wax frequently and live in beautiful S. Cali weather, so S100 is now the wax of choice for me. Blitz does get used on the wheels however and looks awesome.