Would be halarious if all 3 game chose the same release date XD
Zelda will be the lowest selling of the 3. UC4 & Halo 5 will battle for best selling. PS4 has bigger install base, but Halo typically sells better.
As far as the ratings go, Zelda U & UC4 will no doubt be rated verry verry high just based on the two Devs. history. Naughy Dog's last 3 game got 10/10 on IGN, and when is the last time there has been a bad/mediocre 3D zelda game??
Halo 5 is a bit of a wildcard. H4 got good rateings, but the lowest of any mainline Halo Game. But then again, it was 343i's very first game as a studio, and they weren't even all the way built up when they started working on it. Now that they are a fully fleshed out studio (~343 people work there), and have had some experience making a game together & such, I think thier next game will be much better. Still, because they don't have a long and reliable pedagree as a studio, we just don't know how good it will be.