Natty, those are the exact three waxes I'm currently using on my car. I'm not using them as a Klasse topper, but of the three waxes, I really like P21S and Blitz, but for different reasons.
As Brad said, Blitz provides a nice, deep warm shine. Of the three waxes, it provides the most depth and has the best durability. It takes a little more effort to use this wax than P21S.
As for P21S, I really like this wax also because it is so easy to use and is very trim-friendly. While it doesn't have the same amount of depth as Blitz, it does provide a very glossy, reflective shine....almost like Pinnacle Paste Glaze.
So your decision would probably depend on which of these characteristics appeal to you more.
Av, I haven't noticed this with Blitz... Sometimes I get a little streaking here and there with both Blitz and P21S. Not sure if it's the wax or QD though because it seems to happen even on non-waxing days.