I think the real question is how much do you value the crit chance over the 130 better attack power on the 5 v 5 piece comparison.

The 5 dragonstalker pieces have:
92 agility
176 attack power ( 268 total )
56 crit rating
10 hit rating
91 stamina

So is the ~2.5% crit worth the 10 dps difference due to attack power?  Is it worth 11 less stamina?  It'll depend on your goals and your play style I imagine.