Neither. I tried both and although they can block some malicious sites, they both tend to block many safe sites and are extremely slow compared to my ISP DNS.
You can test your DNS speed with
DNS Benchmark
First resort back to your default ISP DNS, then run the test.
It takes awhile to complete and the results will be different to everyone depending on your location.
Thanks.

CCloud fixes wrongly blocked sites in a couple of hours if you submit
it to be checked up. I know CCloud does not block much but on my
case my ISP does not block any. So, got nothing to lose by using
CCloud.
Speed? I don't feel any difference at all whether I use my ISP DNS
or CCloud.
Bo