My take on target-date funds vs building your own three-fund portfolio after holding both for years.

I held a 2050 target-date fund in my 401k for 6 years and a self-managed three-fund portfolio in my Roth IRA and taxable account simultaneously. Here's what I observed.

Performance: essentially identical before fees. The target-date fund's glide path didn't make a meaningful difference over this period.

Fees: my target-date fund charged 0.12%. My DIY portfolio averaged 0.03%. That's $270/year on $300k — real but not transformative.

Behavioral difference: zero. I didn't interact with either account differently during market volatility.

Conclusion: the fee difference matters slightly over very long periods. But the practical behavioral difference between the two approaches is small for most investors. The right choice depends on your 401k options. If the cheapest target-date fund in your plan is lower cost than the available index funds, use the target-date fund. If you can build a three-fund portfolio at lower cost, do that.