Tamron 18-270 PZD vs Sigma 18-250 HSM

There are not really many direct comparisons between the Tamron 18-270 PZD (which was my personal favorite candidate) and similar zooms, like the Sigma 18-250.
Here's one:
but honestly... it seems a match without winners and with two losers.
In short, if I summarize correctly, the Sigma seems to have structural problems (heavier, worse AF, not firm) but a better optical quality overall (except possibly, center sharpness).
The review ...

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