i use r1 and l1 on DS3 if its available
the r1 is more responsive for me compared to the r2 or trigger b/c i feel theres more of a dead space in the trigger compared to the r1 also there is a longer throw or the amount of time lapse that you can repress on the triggers compared to the r1 button
also the springs on sonys controller for the triggers tend to break or become weak and feel mushy only after a short time (dont know if thats the same for 360s) so i dont like to map the triggers for something that i use often like shooting and accelerate for racers
i also mod my triggers on all my ds3s with rubber bands so they dont make that loud clanky noise while pressing em i hate that
for sensitivity i dont really mess with it much its personal preference here for COD and FPS i tend to bump it up a little from the devs factory settings to about a 4-5 i play alot of uncharted 2 MP and had the sensitivity at 9 for al ong time i just put it down to 5 default and found out i own harder at the stock 5
i find that the sticks move around pretty freely or are soft for my taste so to much sensitivity ruins your aim idk how others do real good in COD and uncharted with 8-10 sensitivity you would barely need to move the stick they must be used to it so it just comes down to preference
also if you have a tv that has all that 120 240 hz garbage you want to turn that off it does have an affect on input lag and even visual issues like multiple/blurring reticule from my personal experiments you either want an old SD tv or plasma for the lowest lag possible or a LCD that uses a IPS panel
for the 360 vs ps3 controller they have pros and cons i like everything bout the DS3 except the cheap/weak springs used for triggers and the size. the size is actually close to the same as a 360 controller width and height but the 360 has more depth to it so it fills your palm/ hand better
i like the 360s size that i mentioned above about the depth but dont like the d pad or there rb and lb or in ps3 terms r1 l1 b/c it doesnt feel like your pressing a button to me more like a mouse's button click

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