Why is the little giant 3 series more expensive than a quiet one 6000?

[vivioo7]

Ive been looking to get a quiet one 6000 to replace my little giant 3 non x. the little giant is rated for 700 gph and costs 140 while the quiet one is rated for 1506gph and costs 90 and is submersable? why is the quiet one cheaper?

[addicted2reefin]

external pumps are usually more money. to my knowledge the little giant will last u longer. they run on different technologies. the little giant is made out of metal, the quietone made out of plastic. the little giant is a pressure rated pump as well. the non pressure rated pump puts out about 1400 gallons per hour i believe.
also i thought the notso-quiet ones 6000 go for around 130