I have both the Sigma 50mm macro and the 105mmMacro.  With my shots at work, the field of view of the 105 forces me too far back to use the light box!  I think both of these Sigma macros do a fine job.  Yes, the 105 gives more working room, albiet not a great deal more.  Yet, when I put on a macro, it is almost always the 50mm.  The lens works well for general  non-macro shooting as well,  with a crop factor of about a 75mm lens with my Nikons.   The 105 is too limited in field of view for my general "non zoom" shooting with the crop factor of about 158mm.

I cannot comment on the other lenses, not having a Canon camera.