That will depend on your total savings and such. If you start a 401k at 25 and contribute the max until you retire at 72: you will have a lot of money and it is likely the Roth is better just because because you have so much more taxes to pay. OTOH, if you wait until 45 to start savings and never contribute the max, when you retire at 62 you will do okay (most of your income is from SS - better hope it is still there!) but your total income will be small and so you end up in a lower tax bracket. Odds are you will be somewhere between those two extremes.

Roth and regular investment accounts often have the same annual contribution limits, but the Roth has effectively more growth just because you don't pay taxes: 100,000 in a regular account is worth $70,000 after taxes (exact number depends on your state and tax bracket - it might be $80,000 it might be $50,000), while in the Roth it is $100,000.

There is also the gamble. Nobody knows what tax rates and deductions will be in the future. If things stay the same I can tell you what will happen, but I consider the odds of that zero - but the odds that things are close to today I think are good enough - but I have no way of know. They might make a withdrawals from a Roth taxable (this would go to court, but who knows how the court will look in 30 years). They might change the tax brackets - either up or down. They might make regular retirement withdrawals non-taxable (or taxed at a different rate). They might confiscate all retirement funds in some revolution. Or you might die before you retire. Again I think the safe bet is tax rules will be somewhat close to todays rules, and you will live to the statistical average lifespan plus a couple years - but I do not know.