when it comes to wireless, you have digital and fm(or so i assume its fm)

what brands are really good for use? i will probably end up buying a multi system package. but in something like that, does it just run different channels to different amps? i have never used one or looked into them until now. if i went to guitar center or somewhere im sure i could get an opinion for 2 or 3 people, but online i can get mass opinions. thanks guys! (and ladies)