Ideally you want as many Federal vs Private as possible. Rates are much better. That said, I think we moved over some of my wifes private loans to ECSI from Wells Fargo. We got screwed on the rates from WF. ECSI were not bad. We also have loans with MOHELA, Navient, and Great Lakes. I dont even remember which are private and which are Federal at this point lol, but I think they are probably all private companies that might service Federal student loans