FYI: (In the Linkster's opinion both funds should be part of your core portfolio.)
ETF investors want low expenses and diversification. The standard play for millions of people saving for retirement is an S&P 500 Index fund, but there are other broad approaches that have performed better than that benchmark.
The wildly successful Invesco QQQ Trust is one of the best. And if you are afraid that valuations of the biggest tech stocks are way too high, take comfort — they are much lower than they were before the dot-com bubble burst in 2000.