For me I’ve been using MyDomain for years. I have all of my domains hosted with them.
I haven’t really used any other services to host my domains.
Who’s your favorite and who don’t you like?
I had a few domains with GoDaddy because the client wants to use them. They believe that prices are cheaper with them. But eventually, when we moved to the second year, GoDaddy was not as cheap as they expected. Now I am at my liberty o choose whichever registrar I prefer.
Gandi.net, Namecheap has a couple of my projects right now.