All three use the Mini DV digital tapes.
The Panasonic was a very close second, but it lacks a SD media slot (nice to have in the future, I'd think), lacks a pass-through analog port (for converting analog to digital, such as a VHS tape to MPEG), and its image stabilization seemed far superior. I focused both the Panasonic and the JVC on a range hood carton ¾ of the way across the store at full optical zoom, and the JVC was much easier to keep on the same area.
The Canon's LCD view screen looked really washed out, which may be because it was had been running 18 hours a day for the last year in the display case, but if that's the case, that's a good reason not to get it.
The first small camcorder I ever used was my grandfather's JVC, and I think it's still functional today. Hopefully, this one will last as long.