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There's no doubt that the Giant Via 3 is one of the best deals on the planet. However, there's absolutely no comparison between the quality of a Steelwool Tweed and a Via 3. From a more practical economic standpoint, the Via 3 will be able to do everything that a Tweed will be able to do, with the exception of porting loads.
The Tweed has a stronger frame than the Via 3, and will therefore be able to carry greater loads. You will also be a better able to attach panniers and rack, without any heel strikes, since the wheel base is longer.
Tweed will also feel more comfortable on longer commutes or errands, due to the drop handlebars and your varied hand positions available..

The Steelwool Tweed