The CFM is a bit of a 'tractor' engine. More of a cowled turbo-prop, I think. It gets you off the ground better than the V2500 but then stops. The altitude capability is less than the V2500, which is more of a precision instrument. The V2500 is thus far more fuel efficient, which matters alot these days. Although the V2500 A320 takes longer down the runway, the aircraft climbs higher sooner and is more often flying in the 'clear air' than that of the CFM. Thus the CFM also takes the penalty of bouncing around in the weather more often which in turn contributes to the cost of operation. The V2500 gets my vote every time.
Bob.