Recently I have been playing a lot of Resistance 2 mulitplayer and again Rainbow Six Vegas multiplayer on the 360.
One thing that I realized was how much more I loved the dualshock. This was in contrast to how many times I had heard about the superiority of the 360 controller (many times on forums in this site). This led me to find the following article that does a nice job of comparing the two.
http://gamer.blorge.com/2008/11/22/analysis-ps3-vs-xbox-360-controller-comparison/
Also there is another comparison by Matt Peckam of PC World
http://www.pcworld.com/article/153332/is_the_xbox_360s_thumbstick_in_gears_of_war_2_too_sticky.html/
both these articles talk about a 'deadzone' in the right thumbstick of the controllers:
"The dead zone is an area around the center of the analog stick which allows for the aim to rest without the on screen reticule moving all over the place. After careful analysis of both controllers, the PS3 has a slightly smaller dead zone than the Xbox 360’s gamepad"
Having a smaller dead zone leads to faster target resolution and hence makes the dualshock a better controller for shooters.
Of course it in the end depends on user preference. Also it doesn't take that long to get used to a different controller.
I guess gamers who use both the consoles will notice this more then others.

It is better to die on one's feet
then live on one's knees










