Contributions to traditional 401(k) plans are pre-tax, which means that your taxes are based on your salary minus your contributions, instead of your full salary. So, your taxes are lower, and take-home pay is higher.
By comparision, Roth 401(k) contributions are after-tax, which means that you do not receive this tax break during your working years.
A traditional 401(k) could provide an additional $0 of take home pay per year until retirement.
Traditional 401(k) plans are tax-deferred, which means that you do not pay taxes on contributions; instead, you'll pay taxes on withrawals (distributions) during retirement.
By comparision, since Roth 401(k) contributions are made after-tax, qualified distributions are tax-free, which means that your annual retirement income will be higher.
A Roth 401(k) could provide additional income of $0 per year during retirement.