Less loan or invest?

Hi everyone! I'm applying for house loan soon and they gave me the option to pay some down payment of 10% of the total loan amount. It's totally optional though. So I wonder, whether I should pay to have less loan or invest it on my NISA. I don't have the cash for both.

What would you do in that situation?

*sorry if there's a mistake in writing. English isn't my first language

by Automatic-Studio-385