The difference between sanandreas and GTA v was that sanandreas was The first GTA where you could hit the gym, grab a jetpack, fly a plane, swim underwater, start gang wars, Rob houses ... Every other GTA that followed was just a more revised version of sanandreas, there's nothing new to it, well there is but GTA v is just not memorable and you get easily bored with it whereas I still have sanandreas on my laptop 
