IRA vs. Taxable Account (Keeping the money in for 20 years).

IRA vs. Taxable Account (Keeping the money in for 20 years). If I have 500k to invest and will not touch the money until 20 years from now, am I better off putting that money in an IRA or taxable account? No dividend stocks. In both cases, I'll buy VTI or VOO. Put the money there and forget about it until 20 years when I start making withdrawals. Am I better off with the taxable account because it will tax my gains as capital gains instead of ordinary income (and my capital gains tax will be lower)? Thanks!