I tend to take the AD 100 or AD 150 side because of the lifetime warranty, smaller size over FASS, got tech support, and much quieter pump.

Mine is hidden up against my transfer case totally protected from road debris...


I've got 99K miles on my 2nd VP44 but it still going strong!

 

Check out a Airdog II

 

I would go airdog as it's less than the fass, both offer lifetime warranties. But price determines all