Didn't really read azeng97's post properly...
2010 Centaur is Ultratorque. 2011+ is Powertorque. They are incompatible with each other. Ultratorque is better (apparently) and still used on the high end groupsets (Chorus, Record and Super Record).
Ultratorque also needs less tools to service which is only an issue if you service yourself.
As to whether which will actually make a difference in reality... hmmm... If you race, Centaur is slightly lighter and probably has minutely more reliable shifting (if at all measurable), so would potentially add the seconds, or remove the possibility of losing the seconds if you miss-shift, thus allowing you to win the race.
If you don't race, it's bling pretty much.
Ultratorque/powertorque aside, if you are going to spend more money, consider spending a bit more and going Athena. If you want a large sprocket (i.e. 29t) with 10 speed you are limited to a 13t smallest sprocket. This with a compact crankset gives a highest gear of 50/13 which is lower than a 44/11 that most MTBs have. I do notice this going down hill (I have 50/34 13-29). With 11 speed you can get 12-29 which would be awesome as you will not spin out before absolutely everyone, yet still be able to spin past them (with a smug look on your face) while they are all grinding when going uphill
.