I would suggest wes is a much better option. If you have all the documents ready and that to the correct ones, it wont take long for the evaluation to be done. I got my done and they told me that my evaluation results will be declared on the 3rd Dec, however I was surprised when I got the results in just few days and they also couriered it to me very fast ( as I had already paid wes to courier back to me in India)
Where are u applying your FSW from?