After trying both products:

I use Mother's Back 2 Black on my cladding for regular "daily" duty as it doesn't streak if rain hits and takes time to wear off; but, doesn't have the shine I get with STP Son of a Gun....So

I use STP Son of a Gun for car shows or otherwise special occassions when I want the most shine and am not expecting rain to hit...However...looks like *****t if it gets wet and streaks...even dew-drops in the early morning make it look terrible!