Ron Micjan has a comparisson posted on his website .
It is also available as an Excel file in the main menu bar.
IANTD published one for CCRs in their CCR Special Issue of Nitrox Diver magazine
(Winter 2004 - SCRs were in issue Spring 2004).
Stuart and I have been working on one for a while that will be more detailed.
We'll post it when it's done. 
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Cheers
Stefan
"Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media,
which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.'!"
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