144hz or 280 hz?

I own a rtx 3070 and play games like rainbow six fortnite… I currently have a 144hz monitor fhd (c24g2u from aoc) and I need a second monitor should I get the 280 hz monitor from Asus tuf or the same one I have now once again?

If you only use the 280 Hz monitor as a second screen, you should get help.

No this will be my 1 meant that it will be my second one in my set up

Okay, yes I think 144 Hz is enough but if you have the necessary little money then you can get the 280 Hz ^^