Without being able to look into a crystal ball and see our future, the biggest benefit I can think of with Roth TSP over regular TSP is it removes the tax headache in retirement. Nobody knows what tax rates will be down the road, so it's best to diversify by having some in taxable, tax deferred and tax free accounts. Don't overthink things though. For most of us, the tax benefit of a regular TSP is the best option.
Roth TSP is way to contribute to a tax free retirement account and get around income limits if that would prevent you from contributing to a Roth IRA.
Roth TSP has RMD's which can be avoided by converting to a Roth IRA in retirement. You will need the Roth IRA opened for at least five years prior to a rollover.
See also: Roth TSP vs TSP
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