I guess you have to start off with prioritizing a bit;
1) Stopping power
2) Cooling ability of the brakes
3) Weight of the system
4) Ease of installation and those other things
A lightweight bug with around 195wide tires does not need much stopping power to lock-up the wheels. The original system copes with that.
So cooling; Kerscher etc addresses this in them a simple way; ventilated discs, and note; still using standard spaced-out calipers.
The weight bit is interesting; but then you also have to keep close attention to the rest of the setup; wheels, tires etc...
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