Same Nasdaq-100, two fees: QQQ charges 0.20%, QQQM charges 0.15%. For buy-and-hold, QQQM is just cheaper. Full stop.

- Identical holdings line for line; when funds are identical, cheapest wins by definition - Five basis points on $50,000 over 25 years is north of a thousand dollars - QQQ keeps its edge for options traders: deeper, tighter options market since 1999 - Already hold QQQ in taxable? Switching triggers taxes; get it right on the first buy - Any decent screener shows the fee gap in ten seconds; the holdings match in two minutes

Overlap ($4.99 one-time) catches identical-fund traps like this before you pay for them.