Pay down or invest??

[Rousner E.]

So I have a property that cash flows 175 a month after mortgage, property manager, repairs, and vacancy. Should I make extra payments on the mortgage, or invest it in the stock market. I use Robinhood so I get commission free trading and I only invest in dividend paying companies who are well leveraged and not drowning in debt. Just looking for advice from someone a little more mature and experience than me. I don’t want to spend it lol and I know if I don’t give it a purpose it’ll be gone at the next gun show I go to or something.