They are very different games and GTA4 has some sweet mods. So that's why i vote GTA4 --- "Nowhere is longer safe. The earth MOVES under our feet. The great world tree, Yggdrasil, trembles to it's roots."
Oh. You're one of them that thinks that some faceless games ratings are important.
I like GTA4. Masterpiece? Not by a long shot.
The best story, the best gameplay, and most live city of all GTA games. It was a masterpiece in 2007, obviously it will not age well just like many games that were masterpieces in their age, and it will obviously be surpassed by GTA V, but denying the fact that its a masterpiece makes you sound dumb. Its like denying that Ocarina of Time was a masterpiece in 1998. There is a reason this is the highest rated game of this gen. --- i7-4770k | EVGA GeForce GTX770 2GB | Asus Sabertooth Z87 | Corsair Vengeance 8GB RAM Samsung 840 120GB SSD | CM Storm Enforcer | Corsair TX 750 Watt