I would definitely go for the Roth in your situation...unless your income is such that doing traditional IRAs would bring your AGI under the cutoff for Saver's Credit.
What I mean is that there is an amazing credit for low-income earners who save for retirement with a cutoff of about 34,500 AGI or so for married filing jointly (higher if you have kids), where you can get a $2000 credit back for investing in any retirement accounts (roth, traditional, 401k, whatever), meaning that at that income level it erases all of your federal tax liability.
Even if you're above 34,500, there's a transition zone up to 57,500 where you can get a smaller saver's credit back. It probably makes sense to just do the Roth if you're stuck at >34,500. But the most lucrative is definitely if you can get under 34,500 by contributing enough to traditional IRAs to bring your modified AGI under that cutoff.