Having flown both models many times the Ominus handles/flies much better than the Vista....in my opinion. Something they did in the redesign of the Vista caused it. If you want a camera then buy the "fpv" model as they are different. They have lower gears and different motors to handle the extra weight of a camera. You can remove the camera and fly it until you get comfortable with it (recommended) and then you can reattach the camera and fly with it. You don't want to crash with the camera on it !
If you try and put a camera on a regular Omius or Vista it will not fly well due to the extra weight.