Grand Theft Auto are vast open world games, with lots of vehicles to get around in, but are better played in 3rd person. I have heard that GTA5 has a good first person setup though I have yet to play it.
Destiny is more of a online shooter, and from what I gather unless you have some friends to form a unit single play isn't that fun. I would say think Skyrim meets COD but not as in depth as Skyrim or Oblivion.
I hope this helps some, you can find numerous video reviews on YouTube for each game, and have fun with whatever you choose my friend.
- Ellias likes this