Balanced outputs vs balanced design

Friends, I am looking for a balanced tube pre to mate with Halcro MC20. I have since learned that there are single ended designs with balanced outputs and fully balanced designs, like the BAT's. In a response to a thread below the author suggests that the "magic" happens in the amp and that the pre does not have to be fully balanced to benefit from the noise reduction qualitites. If so, is thre any inherent advantage to a fully balanced preanp? And more particularly for my purposes which would not run connects more than 10' from the amp. If there is no great advantage to a fully balanced pre, I can widen my search. As always, tell me about your favorite tube pres to run with this SS amp. Many thanks.