Rear shock choice and advice.

in MTB general
Morning people. Need a bit of advice on which shock to use on a 140mm travel frame. Where do these sit in a line from best to worst? Any experience or points of note. I ride mainly XC. We have a Fox float DPS (age unknown) an Fox DHX 4.0 (age unk) a Fox RP2 (8 years old) and an Rockshox Monarch RT Debonair (3 days old), to choose from. 



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If so, try them all, but I'd leave the Fox DHX until last (the one in the middle of the top pic I believe).
But the banker has to be the Rockshox Monarch RT Debonair. That will give you the least problems and is the most known quantity.