Top 10 usually refers to the most popular, the most used by people, and may vary as to who is best or which ones have the most parked names, one would expect the ones people are using the most to be the ones providing good results but lately that has changed, Parked.com for example, doesn't use Google feeds (they're w/Bing) and a lot of people I know have moved names out of there but they have the best pkg tech, most advanced site by a long shot
Sedo is as dull as dull can get, I don't get good yields there and hate the templates but it works for some; Bodis I'm still trying to figure out what those improved benefits are after the site remodeling, it just does not work for me and they don't have nice templates either
Namedrive, DomainSponsor are both ok w/me, ND has superb templates and you need to showcase your names well to prospective buyers even if a good parked page is no reason to buy the name, but it does help when selling it, DS doesn't accept everyone, though; ditto for Fabulous, that's really a club, real hard to get in but I hear it works well, you gotta have tons of names and/or get real good earnings before you can even apply
WhyPark is a little different in that you'd get a minisite and not the traditional pkg page and unless the domain is already set up there you need to write the code for its configuration, or get help from their staff