Personally, I don't think there would be any significant difference whatsoever for EDC. From what I recall, I think the 710 has a slightly thinner blade, so it might perform slightly better on some cutting tasks. Then again, just the aesthetics of the Ares's blade are superior (in my opinion). I would rather have 154CM in a knife than D2 (due to sharpenability and corrosion resistance), so that would generally mean leaning towards the Ares.
My bottom line recommendation, though, would be to get the Ares for now, if it's available to you. It's been discontinued for a while now, and will only get harder to find. Since the 710 is still in production, you can always get it later. And in the long run, won't you be a good knife knut anyway, and ultimately end up getting both?