I'm not going to speculate in the frequency of sets on average, but it does look to me like West coast beaches get longer riding waves when they have them. I suspect that is because the East coast drops off in to the ocean at a steeper pitch. The Atlantic is much deeper than the Pacific isn't it? Like skiing, surfing is much better in the East than it is in the MidWest BWAHAHAHA
Is that Jer? I can picture him doing that..
The west has more classic point breaks like Malibu, some great longboard waves, some funky cool spots, deep canyons that go almost all the way to the beach in some places so swells don't lose power, and the odd real scared seal. It also, in particular in the summer, has crumbly mush a lot of the time. Similar to some western resorts that don't ski all that well unless they've had a fresh storm. But can be awesome.
The continental shelf is a big problem for the east in terms of draining some power from waves. But, there's generally some windswelll. Just like rain and temperature variation is a problem with EC skiing more than out west. And, Ireland, not a big hop as these things go, offers truly great big wave surfing when things line up, just like the east has great ski terrain and, sometimes, great conditions.