Loop vs. ball end strings
Instruments- discuss specific features, luthiers, instrument problems & questions
From the comments so far, it appears thatthere really is no functional difference for tone or playability. I'm using ball end strings on instruments that have very slim metal pins to anchor the string. It always looks as though the pin is so slim that the ball (really a brass circle inserted in the loop) will save some stress that would occurif I were to put the "naked" loop on the pin. And I save the old brass circles, too, and re-use themon a plain loop if that is possible. About where strings break, most of the time mine break at the tuning peg, but the last time a string broke, it was at the pin below the bridge. Really. And I was able to save the brass circle since it was still on the pin.
Thanks to everyone who answered, and of course more input is welcome. I've played for about 20 years and never have had a good explanation of loop vs. ball end.