In the old Saint's Row , You were able to do more. For example, you could go inside the beer store and aim at the shop keeper they'd bring you to the safe with the cash. Another example, if you shot the cashier money would come out. Those small details in games like GTA and SR are the most entertaining. The new GTA lacks the fun of Airplanes, Parachuting and even simply entering into more buildings. Without a doubt GTA will destroy SR with the story, nothing will beat that, and the graphics are going to win as well. But overall I see people having more fun with the off-mission stuff on SR than on the mission stuff.
And that would you rather video is really smart, effective and wants me to buy SR2. I'm undecided at the moment, because I plan to get BF: BC soon.