Got my new hoses. Just happen to get a set from Mishimoto and a set from Roe Racing so I decided to make a comparison.
Durameter readings are identical.
Caliper reading showed thickness was identical.
Both have the same number of fiber reinforcement rows.
The Mishi (left) is red all the way through.
The Roe (right) is only red on the outside layer. The inner layer is a brownish color.
Mishi comes with only the hoses and arrived in a couple days.
Roe includes clamps and a license plate frame and arrived in five days.
Conclusion: None. I'm not a chemist or engineer. Roe supports Vipers so I suggest Roe. Price is only a few bucks more and you get the clamps and a really nice 100% real plastic license plate frame.
Also, I have a 100% pure plastic original license plate frame for sale. Never installed. First $200 + shipping takes it.