have you driven both or any brera?
the V6 is more powerfull/fast, but the 2.4 diesel is more "driveable"
we could have chosen any model (traded in a 350Z GT) and chose the diesel as it drove far better (in real traffic)
ive no doubt the V6 is better on track/straight line/0-60/round twisties et al, but for round town/tesco's/commuting (ie: the real world) the 2.4 diesel is way on top.
have both for a week, not just looking at book figures and then make up your mind...we did.
i prefer the drive of the diesel compared to my 4.8 V8 twin turbo porsche. in everything except long motorway journeys.
but you would have to drive one to know what i mean.