Comodo DNS is convenient as you can add its option to Comodo browsers only or to the all PC traffic. First option is useful as it has comparatively high rate of false positives which cannot be bypassed.
Yandex DNS is the fastest for me as I'm russian user and my ping to Yandex is minimal among all the competition.
FoolDNS does good job for me as it blocks max number of web-trash (ads, bugs, malware sources, tracking etc.) that is the reason of real slowdowns in browsing experience and high-load in RAM and CPU terms. After connecting through this DNS-service I've got my Facebook and other socials working twice better in speed and load terms - I was really shocked!