Both are great sporting events and are enjoyable to watch but I prefer watching the athletics and cycling in the Summer Olympics. Plus the Summer Olympics features more famous athletes and seems more competitive. The track events are a lot more exciting than the likes of downhill skiing or curling.
There are more sports in the Summer Games that I recognize and enjoy compared to the swinger Games. I find the Winter Games a little boring because a lot of them are very similar and all if them involve either ice or snow. With the Summer Games, you have sports in water, at the beach, or on land.