One advantage of going Roth is that it increases the amount of money you can put into tax-protected space.
Even though the nominal limit of $53K applies, because your Roth money is after-tax, it represents a larger portion of your income. This skews the equation toward Roth a little if your goal is to save more for retirement, and you don't have cash flow issues today.
Of course relative tax rates are likely to still be the overriding concern.
Scenario 1 - Tax-deferred - 25% tax bracket now and at retirement:
Invest $100 pre-tax now, 10 years growth at 7% turns this into $196.7, pay 25% - leaves you with $147.5.
Scenario 2 - Roth - 25% tax bracket now and at retirement:
Invest $100 after tax now, 10 years growth at 7% turns this into $196.7, which is tax free.
Scenario 2 is ahead because the $100 after-tax actually represents $133.3 pre-tax. If you're bumping into the limits of your tax-advantaged space, investing after tax increases your effective limit.