They are different, so it's kinda hard to say. The digital 8 has a much better zoom, but for Disney we love the DV (which is why we bought it) because it's so much smaller and lighter. They both take excellent video. The digital 8 has cheaper tapes and they can record for longer periods of time. If it's something you are going to be carrying for long periods and you can swing the price, I'd probably go with the Mini DV, but if not, a digital 8 is an excellent camera as well (we haven't brought ourselves to part with ours, even though we bought the other one LOL).
Erika