i've had the chance to play Valkyrie on the Oculus when it was still named EVR in April 2013, and i really enjoyed it as you can read in my
blog .
Comparing EVR (or Valkyrie) with Elite: Dangerous is tough, since lets be honest, the Oculus Integration in ED is not working very well at the moment.
To me it seem impossible to get the convergence set right (a tool to do so other than the slider would be great, also i don't think you can go far enough with the slider), the lighting of objects is wrong (for example i have seen asteroids where opposite sides where light/dark depending on the eye, which makes it look somehow weird and out of place), and opposed to Valkyrie, you can feel tracking lag.
So keep in mind that the experience with ED atm is hopefully not how the final game will feel.
From what i remember Valkyrie feels a lot faster paced, more adrenaline pumping, and your ship feels smaller. If you have watched the new BSG, thats a lot like valkyrie felt - being catapulted from a carrier ship into an ansteroid, dogfighting in extremly small fighter crafts. In ED the ships feel a lot larger, the movement a lot slower and less agile.
I have no idea how CCP is going to integrate valkyrie with EVE (they just said they are going to), but i know they wont have you being able to control fighters in the current EVE battles (you can't dogfight with 1 second ticks (or longer in TIDI)).
The ED Alpha plays pretty much like i expected an Elite to play like.
SC.. i can't really compare SC to anything yet since so far all they have is a lot of artwork (and i don't play games exclusively for their looks), a hangar module (basically a viewer for their ships (no oculus support yet)) (EVE Players might call that module walking in stations), and a lot of conflicting information on how the gameplay will be (Kickstarter Campaign vs. CIG websites vs. what the community thinks).