I've used both. Both seem to work equally well. Well, I might actually prefer the AVR because the tone stays on as long as you want it to. On my Avia DVD, it is a fixed length. Should be more than long enough most times though. Sometimes I need the extra as the Dog is clicking his way across the floor upstairs. Well, that or I need to cut his nails more.

With great power comes Awesome irresponsibility.