These are very different lenses, so really hard to say what is 'better'. The sigma is a full 2 stops faster, meaning you can get shutter speeds 4 times faster in the same lighting conditions. But you're fixed at 30mm.
I used to own the sigma and loved it. It was very sharp, focused quick and quiet. very little light fall off. The focal length was great for indoors. I've have also shot with the Tamron 17-50mm f/2.8 and really like that one, but never really compared image quality to each other. I have read that the new VC version isn't as sharp as the older non-VC version.
@sudweeks Well I'm planning on getting more into photoshoots. More likely portraits. I would also like to have to use it to go around and shoot anything else. But then, my main argument is that I do shoot in low light a lot. Usually concerts and band performers or just typically in low light. I'm also looking for sharpness and bokeh and blur.
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I used to own the sigma and loved it. It was very sharp, focused quick and quiet. very little light fall off. The focal length was great for indoors. I've have also shot with the Tamron 17-50mm f/2.8 and really like that one, but never really compared image quality to each other. I have read that the new VC version isn't as sharp as the older non-VC version.