[crunchy1]

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Further questions....
What do you do in this exact same situation with

9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
T [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/club.gif[/img]
J [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/heart.gif[/img] (suits are irrelvant, I just like the icons.)

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As others have said - pretty "opponent dependent". Against any player other than the rocks who are only raising AA-QQ I think it's a 3-bet. I think the key here is the number of times that you will win UI with these 3 hands versus the number of times you'll win UI with 55. It's also worth noting the increased number of favorable flops where you're pair is a middle or over pair with JJ-99 compared to how often that will happen with 55.

There will be much more opportunity to "pick-up" the pot with JJ-99 than with 55. (I think this also increases because these hands are worth 3-betting most times PF - which put's your opponent on the defensive from the outset)