I've noted this in the Alps Appreciation thread, but the acoustics of Alps switches seem to be pretty dependent on the boards their in. SKCM Blues sound great in larger boards, not so much in smaller ones.
That said, I am quite in love with the sound tactile/non-clicky Alps make when they bottom out. Beam spring switches sound wonderful, almost like rain drops.
Worst-sounding switch is, by far, Cherry MX Blue, the sound of plastic hitting plastic is not pleasant at all. Do not like switches that are overly pingy either.