What are the key differences between a traditional 401k and a Roth 401k, and which one would be more beneficial for my retirement savings?

The key difference between a traditional 401k and a Roth 401k is how they are taxed. In a traditional 401k, contributions are made with pre-tax money and withdrawals are taxed, while in a Roth 401k, contributions are made with after-tax money and withdrawals are tax-free. The choice between the two depends on your current tax bracket and future retirement income. If you expect to be in a higher tax bracket in retirement, a Roth 401k may be more beneficial.