By all accounts OpenDNS has more widespread DNS servers and is faster. It also has a dashboard function where you can customise what you connect to. I used that for many years without problem, only since I went on to BT Infinity broadband, their router/modem won't allow for a change in the DNS or I would still be using it.
Some other DNS solutions have come along after OpenDNS, personally I still think it is best; I still get their newsletter and they are always developing it and looking at increasing the servers and having them geo-location aware, so you would use the one nearest to you.