What I like about SEDO is that you may post comments on the counteroffers. There's really nothing wrong with the way SEDO works for selling domains as far as I am concerned. DomainAgents allows the comments too.
I'd like to see that posting comments during ongoing negotiations ability implemented at Afternic.
I get offers and pricing inquiries all the time at SEDO, DomainAgents and Afternic, and all I have done with them is upload my domain list. Supposedly at Undeveloped absent my using their landing pages I will get no meaningful exposure,
https://www.namepros.com/threads/undeveloped-com-experience.893201/page-9#post-6377601
so as far as exposure, I have nothing to say against SEDO, DomainAgents and Afternic have sold at all three.