Swissstop flash pro brake pads. Black or green?

I'm thinking about upgrading the brakepads on the missus bike and my bike to some swissstop flash pads as our current pads are shocking.
What's the difference between the green and black pads apart from colour and a couple of £. I'm guessing a compound difference. Are the greens worth the extra?
Thanks in advance.
What's the difference between the green and black pads apart from colour and a couple of £. I'm guessing a compound difference. Are the greens worth the extra?
Thanks in advance.
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otherwise:
http://superstar.tibolts.co.uk/index.php?cPath=22
Yes, they're expensive, but from what I've read they're worth the extra money.
Back to the question, I won't go back to Kool Stop Salmons. Green wear down too quickly imo. Black last a lot longer.