Should I buy down interest rate?

[Leewood Chan]

I just got a deal for 3 beds 2 bath rental property for $247,500. The estimate rental is about $1,550-1,700.

My interest rate is 6.375%. My lender want me to buy down 1% with $1,800 Which make my interest 5.375%.

I asked my lender if I want to buy more down how much it will be. He said for 2% down is $4,990.

My question is which one should I choose 1% or 2%?

And it is wrong idea to buy down interest rate?

thank you