LogFAQs > #974880384

It really depends on the interest rate on your mortgage. If it's less than 4%, a high yield savings account, treasury, i-bond, or money market fund are currently beating that.
And of course over time a S&P 500 ETF or mutual fund will destroy the 4% return (if you have the risk tolerance).

There is almost no chance paying your mortgage off earlier is a better investment than the free tax-free money from the remaining 3% of your employee match (and its compounding over time).