Bluetooth Wireless vs. Regular Old Wireless

I am in the market to purchase some wireless headphones I can connect to my audio system so I can do my cardio while listening to tunes and not disturb anyone else in the room.

My question is, which sounds better a Bluetooth wireless rig or a regular old wireless rig? Honestly, I'm not even sure there is a difference...but want to punt the question out to my expert compadres here on Audiogon!
Bluetooth is more common so you could run these from any laptop, iPod touch or iPhone too...