If today you save a pile of money that good enough to invest a second house with downpayment + renovation to rent out.

Would you use it to acquire a rental house or dump into your existing house loan to clear up the debt faster?

Or you will invest in stock market?

What would you do?
Take note that if you acquire second house, there is a risk of cannot rent out or unable to cover your instalment.
Your saving power will be affected, and your debt will be higher too.