The reason I like the cannon mini-DVs over the Sonys are:
-Better optical zoom (18X on ZR-60, 20X on ZR-65)
-Analog pass through (dunno if later sony models have this, the early "inexpensive" ones did not)
-better form factor (for me, anyway)
-and ability to plug in an external mike to eliminate motor noise from recordings of events like plays and recitals.
The negative about the Canon, is that it has a fairly narrow field of view - somewhere around 53 degrees, IIRC. Most other cameras have a measurably wider field of view, but not more than 5-10 degrees more. Also, if you do a lot of tripod recording, the door opens up on the bottom, so you have to dismount the camera from the tripod to switch tapes. thats a common affliction with many DV cameras, though.
I actually own a ZR-40 (precursor to ZR-60). The only difference between it and the 60 is that the 60 doubled it's resolution, giving it a much sharper picture than my ZR-40.
The Sony Digital-8's have AWESOME low-light (not talking about no-light IR, but true low-light) capability - I was recording by candlelight WITHOUT using the "slow shutter" mode, and everything was visible, and even colors were mostly acceptable. (about 30 candles, but I was in the balcony, and the subjects were on stage about 100 feet away) Buty they are bulky and have no microphone inputs or analog inputs (for converting tape to DV or passing analog video into the computer). A bonus is that 8-mm tapes are about half the cost of Mini-DV tapes.
You will read comments about the motor noise being recorded for various models of camcorder. From my experience (buying two different ones, borrowing two others) they ALL record motor noise to some degree. I found the Sony digital-8 motor noise just as annoying as other people found the Canon's to be. The noise is not noticeable in situations that have a lot of background noise, but when the background goes quiet, you can really hear the motor on the tape on most cameras. Just a side effect of having the microphone built into the housing less than an inch away from the motors. *shrug*
BB