Some are just better than others. Sony has a unique way of using an Active Interface Shoe which you can attach a microphone or light. Very convenient. I would say Sony has a pretty good set of microphones.
I'm looking for the best camcorder with microphone input under $600. I'll use this for video reviews on products while on a tripot.
Any help is welcome

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic