Well this finally gave me the bump to move my DNS away from Dreamhost, which I have been meaning to do for literally years, now to sit and wait for the new name servers to propagate.
Larger DNS providers are harder to DDoS and also tend to have more DDoS mitigation in place. This is not to say that it can never happen, but it's substantially less likely.
I dont think DH is really all that small. Comlared to aws and stuff maybe but I think they have pretty significant infrastructure.
What Dns providers are you thinking of? My guess would be something like cloudflare would be a good choice. Though Ive never looked into it tbh, I run my own dns.