in the west coast we have the Pacific ocean and on the east coast we have the Atlantic, however because the ocean is called pacific and most of the time calm it does not mean that nothing would happen, we have all the faults that create either earthquakes or even tsunamis, I would suggest the east coast is safer
Neither are safer. Geologists have been saying that an eruption on of the Canary Islands may cause a land slide of an entire side of the island, and weighs several million tonnes. This will cause a Tsunami which will head about 20 km inland. It will happen too quickly for an evacutaion to occur. the ewst coast also has a risk because of the Pacific plates and smaller ones in the area.