Why do you want to know? For amusement? Cause it really comes down to the euip ment matching the job to be done.
Aside from totally custom I would think scania is better becuause they tend to sacrifice less in the name of power while euro volvo has pushed their engines to higher power sacrificing longevity.
Of course I could be totally wrong.
One of the things I like about the scania is the way the do their windows, sweedish futurist style and when done right on a truck its pretty badass. What i like about the fh2012 is the way the redid the look of the truck so that it look sleeker.