If you're asking for the decision between Traditional and Roth IRA contributions, the logic goes something like this:
- What's your marginal tax rate now?
- Assuming the tax structure stays the same, what will your retirement expenses require you to take out of your IRA each year, and what will the taxes be on that?
If the taxes are higher now, put your money in the Traditional. If your taxes will be higher because of high expenses in retirement, put the money in Roth.
There's much more nuance to it than that, but that's a place to start.
Since you're married filing jointly, I think your overall limits would be the same. Whether you've exceed Traditional IRA limits for yourself and/or your wife depends on your overall income picture. (I think it's based on AGI.) Without that, the questions can't be answered. Additionally, what you "have" as far as accounts does not determine where your money should go. You can each have Traditional and Roth IRAs. You can even have multiple accounts of each type. But when you file your taxes, you need to follow the IRS limits for how much you've contributed in each tax year to each type of account.