I wish I had taken the right here

The Sigma I first ordered, for 399, - EUR Online at MM I could not resist. That was not bad, but ...
... The stability relatively loud (if it was quiet) and the auto-focus (I need at Portrait, etc.) went like this. Image quality was good to very good.
As far as I can tell as a layman. Top but is processing.

Then ordered for fun and compared the Tamron, according to various tests which should be Better.

What can I say, it is the better. Apart from the processing here is the Sigma a star forward.
Otherwise, the Tamron is exactly what I wanted.
Fast and quiet autofocus, great stability and great image quality.
Only the plastic housing would be a star deduction worth mention here is union through the 5-year warranty again.

Tamron can easily convince here. It is already my second after the 70-300 VC USD and also the service with Tamron's OK.

So can recommend without hesitation, even if the original Canon was not yet in my hands this macro.