Here is an interesting article on these two, I guess that I was the only one that did not know they are made by the same company using the same technology. Check this out: http://www.automfg.com/articles/129901.html

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'98 F250 LD, 4x4, 4.6, 3.73,Superchip, K&N FIPK, Granatelli MAFS, Borla Cat Back Twin SS Out-The-Back, Bosch +4's, Michelin 265/75/16 E ATX M/S, Rear Lift Bags
HIPER 130/110W Superwhites, Edelbrock WTB

 

From performance unlimited:

Rancho admits the Reflex (and accordingly, the Edelbrock IAS) is designed more for smooth riding vehicles with minimum travel in low speed mild terrain situations. In other words, street driven or slowly driven trail riding off road. For heavier vehicles, higher spring rates, long travel suspensions and high speed off roading and/or jumping, the 9000 would be much better. As a side note, a Rancho engineer stated that the Reflex was 'somewhat' based on the Monroe Sensa-Trac (same company), yet the original sensa trac design did not stand up to their testing, so a much improved version was created... The Reflex