I've put my money on redbook, because the format has just so much music available. With a good player the sound quality is as good as one could reasonably need, for entertainment purposes, anyway. Of course, what constitutes a "good player", and what each of us needs to be entertained, is open to interpretation, but I'm darned sure you don't need SACD to be moved by Mahler, bowled over by Beethoven or seduced by St. Saens.
As soon as the number of new titles available on one of the new formats equals the number of new titles available on CD I'll consider switching. Next year? The year after? I think not.
As soon as the number of new titles available on one of the new formats equals the number of new titles available on CD I'll consider switching. Next year? The year after? I think not.