Without a doubt, GTA V. At first I was wary of the game and thought there wasn't much to do in terms of gameplay, but as soon as I earned enough money to buy properties and open up sidemissions, explore more of the city and find easter eggs, open up smaller side missions and customised the main protagonists more, I just fell in love with it.
Saints Row IV at first, was fun, but it's just not a game I can repetitively replay over and over. The main story is just too weak and short, and there isn't much gameplay to do outside of missions. Yes, it does offer funny things such as shooting a person with an inflat-o-ray, but it easily loses it's comical value, and once you conquer the city, there truly is nothing to do. I commend the game for doing good things for the story such as bringing back Gat and Ben King as well as Matt Miller, and introducing Asha and Keith David, but the story is just too short to enjoy. It took me two days to 100% it. I played GTA V nonstop for a week and I couldn't 100% in that time. I get that GTA V was in development for five years whilst SRIV was in development for two, but there should still be some signs of actual progression in gameplay, customisation, graphics and story - There is in GTA V, clearly from the start of the game, but SRIV just reuses these factors; it doesn't improve or weaken, just stays the same level.
Arkham Origins to me looks interesting in terms of it's story and because I am an avid Batman fan, but it's not a game you'll replay over and over for gameplay. I might do so though once I know more about it's multiplayer and the crime system.