There's the obvious similarity in lineup structure, and they're both English and from basically the same time frame. And a lot of high-quality prog output, of course, especially in the 70's. But one important difference between the two bands was that Yes seemed to have a lot of focus on the individual musicians, whereas Genesis with its more stable lineup tended to emphasize the ensemble and the composition more. They each had their moments to shine, but to me it still felt like the song itself came first. With Yes, I think it was either Bruford or Squire who said that it seemed like a contest to see who could play the most notes per minute. There's a lot of showboating in Yes. I'm okay with that; I like hearing the guys push each other. But I also like the focus on composition that Genesis had.