It's always DNS - is it best practice to use a static IP if you can for your domain's nameservers at the registrar?

I'm getting AWS Route 53 set up for a domain that's registered with Namecheap and I was just plugging in my aws delegation set as the nameservers under the custom dns bit in Namecheap.

Is there any benefit here from entering the static IP of the AWS dns servers rather than the domain name I've been given (looks like ns-xxx.awsdns-xx.net)

I read something about this here that's confused me a bit - https://serverfault.com/questions/222641/in-dns-can-an-in-ns-point-to-a-cname