My personal view:
a) If you want to get a universal camera select one with a shutteropening of 180 - 200°.
b) If you want a camera with best lowlight possibilities select one over 200°. Have a look for your requirements: for zooming, select lenses with best opening factor and all other features you want to own.
c) If you want a camera for brightlight conditions look for acamera with shutters below 180°. Keep in mind also your other requirements.....
But be aware: the overall "best" camera does not exist! Of cause the more expensive XL(S) Canons are fine universal cameras. But like any "universal" it must not be the best for a special tasks...
Very fine lowlight "XL" Super8 cameras are made by BAUER (XL series), BEAULIEU (6008,6028), CANON (electronic: 814 and 1014), CHINON (pacific200/12XL), COSINA (professional series), ELMO (612, 1012), MINOLTA Nizo (integral, 1048 to 6080) and SANKYO. For special features and modifications please see ADAMS64.
Professionals who are familiar with all this technical stuff knows: The best lowlight camera does not have any beamsplitter for TTL or viewfinder. But a lens with good opening factor (also interchangeable fix focus) with few lensgroups - like some 16 or 35mm professional moviecameras or old Normal 8 cams.
For making films in real lowlight conditions I own a budget KODAK camera without any beamsplitter and TTL metering. For sharp picturestanding I have modified the filmpressure and also added a "+/- correction" for automatic aperture setting. With this camera I (and a friend) have made several fine filmscenes and had never problems with a parallaxfree viewfinder!
If I need other features like fades, backward filming or different fps I currently use my modified BAUER A508 combined with another XL lens f1.2 7-42mm (with only few lensgroups). This gives me some more light than the original A508 or A512 lens.
And of cause I own some other cameras for using in bright light condition. Each for a special task.....