The later for me because the game looks stiff boring (with Crystal Tools they would have managed massive scale dynamic battles, but it would be released even after the 2 FFXIIIs) but SE needed to bring this out to support current-gen consoles and get experience on working with the UE.
And having a dedicated team that constantly works on worldwide acclaimed engine, that is actively supported and expanded by its developer, is a great boon. I´m pretty sure this team next game (most likely also made on UE) will be from a technical standpoint much better. Also the UE is developer-friendly, so they´ll be able to make games faster than with the current Crystal Tools.
Also, aren´t people moaning how FFXIII and Versus take so long? Then shouldn´t they be happy they are getting a game that started development way after both and is already being released? Their fault if they believe that creating a new engine from ground up and then immediately start development of your biggest project won´t take a heck of a lot of time. Honestly, they should ,you know what, themselves and eat TLR up.