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Likely popularity. The blue Etecs don't seem nearly as popular. I usually only see them on single engine fresh water boats. But thats just a guess on my part.
Its still a popular misconception that only the white Etecs are intended for saltwater use.
The white used to be for saltwater and had more stainless steel parts than the blue, including a stainless steel steering arm. That practice was discontinued in 2008, I believe as my 2007 has the 'Saltwater Series" sticker