Advice on which camera to use

I need to shoot a series of simple interviews, without using a lighting kit (maybe an on camera mounted one) and only using a handheld mic connected directly to the camera.

I have access to both a DVX-100 and a Panasonic AVCHD handheld camera (not sure of the model number though it is about 2-yrs old). I prefer working with the AVCHD workflow, though I am not sure which camera will produce better quality video and sound in this type of environment.

1. Which camera would you use in this type of environment, with unknown lighting?

Thanks for any advice!