Which Dedacciaistrada fork

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For a new Titanium project I am looking for a fork. The fork has to be stiff and I can chose for
a Dedacciaistrada fork. Can somebody tell me what the most stiffest fork is.

Deda EDG 3K
Deda SURF 3K
Deda RS 3K
Deda RS 3K (UD)
Deda RS 2 3K (UD)
Deda STREAM 3K (UD)
Deda STREAM UD Alloy Steer

Thanks