Shorter top tube, thinner tubing,
But you want to know about the ride. The Yo feels like a corvette, the Wicked more like a really well tuned Impala. Still bitchen to drive/ride, but completely different. I had only ridden Yos until a few weeks ago. I would say, on a personal note, that I still like riding the Yo better. But, I really like riding the Wicked too. I'm looking for one now.
Oops... you might not get that car analogy... not Mer'kan, right?
So... Wicked feels like it has a lower center of gravity. It is an incredibly stable bike. It is good in the switchback and slow; goes where you aim in and only where you aim it.
The Yo! You have to develop a relationship with your Yo because it goes where you want it to, sometimes before you want it to. Look back at your (slow) buddy, and you may find yourself off the trail. The Yo is downright twitchy.
Hope this helps. Jim.