minidisk... the little disk that could. your choice should be based on what u mainly do with it. if your working on more music playbacks for dance shows and such then cd will probily better b/c its easer to work with cds and computers to make tracklists for shows. however if your working with a lot of sound effecs and short little sound bites then minidisk would be a better choice because of the whole track and quick sarching you can do but you have to do most of the work rite there at the deck so working on it with a computer can be hard. my best advice to you is to get a CD MD all in oneunit. you get the best of both worlds and usualy are able to dub things from cd to md faster than normal (only on a few tho). but do soem reaserch and figure out what is the solution for your theater
MiniDisc is more the little disc that should, but doesn't really, at least not reliably.
PC based is the most flexible, and between cheap PCs and inexpensive software options, it's certainly a comparable option to buying a few MD decks, although it does tend towards being a little pricier.