I understand that Megascenery is images only with no autogen so it would be probably cheaper.
Problem with the Swiss scenery is that the country is tiny and the mountains are very high, which is a bad combination in FSX because if you fly along the mountain tops, chances are high that you see a lot of default scenery around.
On the other hand flying with 500kts through the valleys and zooming up at a 90deg angle with the Switzerland X scenery is a breathtaking experience.