Like everything else - there are different grades of studded tires, with different numbers of studs, different performance characteristics, different qualities of studs and different prices. I bought Nokian 240s myself because I know that many times a year, I'm going to have to drive on bicycle paths that have been flooded with melt water during the afternoon, but are still sheer ice underneath all that.

The only time I've ever had an issue is braking on steep grades - the wheels WILL still slide with the brakes engaged. Course that's true for cars and buses on those same hills too so I try to avoid them.