Extra Mortgage Prepayments vs. Investing

I keep going back and forth on putting more money toward investments, or more money to pay off my mortgage faster. My renewal is up in Dec. 2025. I currently have 8 years and 2 months remaining amortization till the mortgage is paid. I basically will have a good 46k to put toward either or both. At the moment I decided to do half toward investing and half toward the mortgage.

I feel like I will have big relief paying off the mortgage. That peace of mind is really nice but so is growing the investments. What say you?