I have swisscom on my phone and my daughter has orange. She always seems to have very good signal strength in the Lausanne/Riviera area. When we travel so far sometimes one is better than the other but on balance they are even. Orange seems to continue to improve with additional stations, satellites etc... I'd go with the one that doesn't lock you in for 24 months (this type of contract seems to be a hold over from the days when Swisscom had more of a monopoly.)