When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Good question... It really depends on what you are looking for. ISC has 32 levels of dampening adjustment while the Flex only has 16. The flex Coils are stiffer than Tein SS or SA but not as stiff as the ISC Coils. Both allow for you to go pretty low but I feel the Flex Coils allow you to go a little lower if that's what you want. Overall I prefer the Flex's.