If you have spare cash lying in your bank saving account at the moment, will you rather use it for investments eg ETF or use it to clear of your current housing loan just to reduce debt?

I would say that clearing off your debt should always be your number 1 priority! Debt will only accumulate over the years with the power of compound interest and your investments might not even yield positive returns consistently, to put it frankly. Also, if you ever lose any source of income one day, you would not want to be troubled by your debt obligations.

Always pay off your debts. The relief of being debt free is one of the best feelings in the world personally :)

Depends on the cost of debt. If low, better to invest it at higher yielding opportunities. Otherwise, pay it off.

Service your house repayment at the max amount you can handle. Leave around some cash for investment.

Clear the housing loan assuming loan interest is higher than rate of return from investment