Will you be dealing with the video on the computer? If so, stay away from the JVC. There's too many problems in that arena. The Sony is great for the price (Mfg. price that is). I am assuming you'll get it for less than that.

Megapixel count isn't everything. Usually, the larger the sensor, the better the video. However, an increased pixel count means smaller pixels hence less light. For a better representation, I'll try a formula.

JVC- .5 inch sensor divided by 5.37 megapixels = .09 (a constant)
Sony- .33 inch sensor divided by 2 megapixels = .15 (a constant)

With those results in mind: The larger that number (.09 for JVC and .15 for Sony), the better the video quality with respect to the sensor itself. This excludes processing the image. FYI, that test is not formal, it was just a visual aid.