GTA vs Saints Row

That's a difficult question, it's like the endless fight between CoD and Battlefield.
Both games do have their own advantages and disadvantages.
In the end it depends on the individual person. Some like the totally messed up and weird but funny atmosphere in Saints Row, some like the funny, yeah nearly hilarious storyline and the awesome individual characters in GTA.
It depends on you, for me GTA wins this race. Not because Saints Row is bad, no, I really enjoyed playing it, and I'm still playing it sometimes, I'm just more into GTA and I like the atmosphere in there a little more.