When I was last looking for 205/50-15 winter tyres, non of the top brands were bothering to supply this size. However, the Semperit Speed Grip 2 (a Continental brand) came very high up in a couple of tests, so I went for those. The Semperit is consistently a top performer, better than Falkens or Toyos at about the same price. They are a very good winter tyre all round and, at least in Germany, they are very well priced.
If you go narrower (195/55-15?) there is much more choice and the premium brands are also available at not much more but they don't seem to be much better either. The other car is on Michelins which are also excellent.