Halo. But it's not as close as i thought it would be.
I'm a HUGE Halo fan. The only one I didn't play at release was the original (probably because I was when it came out).
The storyline is far superior in Halo. Halo 2 was decent, but Halo 3/Reach had an amazing and challenging story that I loved. 4 was decent.
Destiny basically doesn't have a story.
But I have probably had more fun playing Destiny's online. Even though it has more flaws, the replay value is very good. Plus my friends have gotten into it as well. It's more than just competitive multiplayer.