Both are good calibers, but .357 Magnum is proven over a much longer period, and is still one of the best calibers around today in stopping power.
Of course, you get 11+1 rounds in the Stoeger, and only 7 in the Taurus. But a lot of people think that is more than enough in .357 Magnum.
I wouldn't worry about the possible QC issues with the Taurus. They have a lifetime warranty so everything will be fixed if issues come up.
I honestly don't know much about Stoeger as a brand, but I own a Taurus semi-auto and while it has given me one or two problems, I feel they are negligible considering the lifetime warranty.
In terms of the calibers alone, you can't really go wrong with either. There are people for each who swear by it.
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