First off, great job on having some extra money to ask this question 🙂 A cyber fist bump for you my friend!
A very simplistic way to answer this question would be with another question. Do you think you can earn a better return on your investment than you are paying in interest on your mortgage?
If the anticipated return exceeds the interest, then the investment would make more sense.
If you would like to have access to the funds in the future for some reason and your mortgage product is not re-advanceable (ie. line of credit) then you might want to put it in a cashable investment instead of as a lump sum payment on your mortgage.
Click here for a link to a good calculator that will allow you to run some scenarios to see what different savings options look like.
Go ahead, plug in different numbers to see which option would be best for you 🙂 Have fun!