Not Ranked
There are a couple issues with fire systems that shouldn't be overlooked---TIME--Capacity-- you said a 5 lb system---this is a bare bones minimun --Nozzles---they aren't all the same altho the look the same--many are 3 hole and many are 6 hole--generally if 2 are used in the engine area they are 3 hole--if only one is used a 6 hole--
Drivers area---mounting location could be discussed for hours but there are only TWO varibles---what the rules require or driver preference--- the nozzle should discharge in a method that will let a driver stop the car, unfasten harness and get out----if its too hot around your feet, you might not use the brakes but would certainly let off the accelerator-- but above all, you don't want to wait for your harness to burn off to get out so you need some flow near the buckle!!!
The biggie I guess will come down to flow/time issues and not number of nozzles, but number of nozzle holes, placement( rules/personal preference) and volume of retardent--
Closed cars vs open cars will change flow characterists of the retardent
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