I'm actually having a really tough time deciding between dex and str on a q-staff stealth build (12 fvs/5mnk/3rog if dex on damage is chosen).
On the one hand str normally gets you higher damage and you don't have to spread out your stats as much. You also qualify for overwhelming crit.
On the other hand, dex gets you higher reflex saves and improves your hide and move silently, which could possibly matter now that sneaking works differently. You will be able to do things like sneak at normal or better movement speed through enhancements as well as jump and tumble while sneaking. Plus monster sneak detection is getting cleaned up. This might make a lot more quests start looking like Claw of Vulkoor.
I don't really consider tactics something to consider on builds that aren't splashing fighter or paladin for strength boosts and tactical bonuses, so that's a non issue.
Anyway, its a trade off. I don't think it's as cut and dry as just considering DPS differences. There are pros and cons to going dex and str.