They're both pussies.
Yuga's power is where its at. I don't remember either of them being able to stop time, have ranged throws, have uninterupptible healing moves, giant laser projectiles (not counting MvC

), and full screen normals. Not to mention the ability to ressurect the dead and turn them into 20ft tall monstrosities.
Overall though, I'd have to say SNK's "power" is more powerful than Capcoms. The only problem is neither company has had the "power" of their series fully unleashed, so its hard to really gauge.