Here is my preferences.
Service: Bullberry will be 3-6 month wait. If you don't mind waiting, this isn't a problem. A friend told me that they have picked it up a little, so it may not be that long. VVCG will be 8 weeks+. Only problem with VVCG is they will put other people in front of you after you order if they pay the rush fee. Another souce is Mike at MBM Co. I don't have a barrel from him but do have some of his other products.
Warranty: All three have accuracy warranties. I dislike VVCG's as it costs you $100. You send them the $$ and they do load development. If they find any load under an inch, they just send you barrel back. If not they send the $$ and a new barrel. Also VVCG's prices went up again according to there web site. IMO, there prices were too high before this last increase.
Looks: I have no preferences. SSK has the best looks of all makes I have looked at.
Accuracy: In all the barrels I have had between BB and VVCG, BB are the most consitently accurate. I have 4 BB barrels and all shoot right around .5". The most accurate barrel I've ever had came from VVCG but the majority of the VVCG barrels I've had shoot 1.25-1.5" for there best load.
For me, all future barrels will come from SSK, Mike at MBM or Bullberry if ordered new.