Not knowing all the details of your situation it's difficult to give you advice. Nobody knows the future or what your situation will be in 15-20 years from now or what it will be in retirement. In my opinion the Roth IRA will be the better investment in your retirement than the traditional IRA because though you pay taxes on the initial investment it will grow tax-free and when you take distributions they will also be tax-free. In your case I would consider moving both of your traditional IRA's to ROTH-s. But not all at once. Each year move a percentage of one IRA so as not to impact your taxes. I would start with the one outside the TSP. When one IRA has been completed do the same with the other one. Any new contributions should be to the Roth, if possible. The above is just my opinion and may or may not be the best for you. I'm currently retired and wish I had done this when I was working. 20-20 hindsight.
