Misty,
I've used all three and had problems with Beadalon breaking, but only wire I've bought in the past year...older stuff is still fine ? don't know what's up with that. I liked Accuflex til I tried Softflex and like Bubba said, it just doesn't kink. It's wonderful! I haven't had any problems with it breaking, even on keychains. I have had Beadalon wear in-two on keychains. Of course they were probably well used/abused too. Make sure you use the appropriate size wire for the weight of your beads and the application, too.
Best thing I could say would be try them all and see what you like...:)
Sandi
If a cluttered desk is a sign of a cluttered mind, of what then, is an empty desk?? A Einstein