We have tested a few:
<a href="http://ipvm.com/report/testing_covert_cameras" target="_blank">Testing Covert Cameras</a>
<a href="http://ipvm.com/report/samsung_covert_wdr_camera_tested" target="_blank">Samsung Covert WDR Camera Tested</a>
<a href="http://ipvm.com/report/testing_pinhole_cameras" target="_blank">Axis MP Pinhole Shootout</a>
I am not sure if we would say any is a favorite.

Favorite Covert Camera And Why?

I'm curious about covert cameras... I have currently selected a Brickcom and client would like to be able to move it around to other locations.
So I'm curious if anyone has a favorite/preference and why... what draws you to that particular brand for example.