The canon 100-400mm f4.5-5.6 by far, its designed for your camera, faster autofocus, has IS, although an older generation of the technology, has been around for donkey years and is probably one of canons best selling lenses for the $$, Ok it has its problems, but significantly better than the 2 sigma offerings.
It's also lighter than the bigma 50-500mm which is really not a good lens, unless your shooting in good light. The bigma is f6.3 at 500, but it lies to the camera and reports it as f5.6 so the autofocus will work on the smaller sensor camera bodies.
The 150-400mm has to be stepped down significantly to get decent shots, so you need good light conditions to get anything worth while. Not a big fan of these budget zooms, promise lots, deliver very little.