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There are at least four 17mm f/3.5 lenses, between Tamron and Tokina.
Tamron SP 17/3.5 Model 51B, with built-in filters
Tamron SP 17/3.5 Model 151B, no built-in filters, newer style
Tokina AT-X Pro 17/3.5 AF
Tokina SL 17/3.5 RMC
I've owned three of the four: SP 151B, AT-X, and SL.
In my personal experience, the Tokina AT-X Pro 17/3.5 AF is a tad better than the Tamron SP 17/3.5 [151B], and the Tokina SL 17/3.5 RMC is a tad worse than the 151B. The Vivitar would be the same as the Tokina SL. AFAIK, the newer SP model 151B is better that the 51B, but I haven't tried the old one.