Long noses offer greater comfort for the driver, US style sleeper cabs are alot bigger, which is very important for drivers that are away for a whole week (or even longer), furthermore since the cab is almost midway on the chassis and not above the front axle ride comfort greatly improves and it's an entirely different feeling when cornering, hard to explain but the lateral motion is alot less....alot nicer and less tyring to drive.
Downsides are a more imited alround visibility, which can be a problem in our cities (idiot pedestrians and cyclists), the extra lenght, which means a shorter trailer and the longer chassis on the tractor means a bigger turning circle, making them all but impossible to use in certain places and applications.
My personal opinion? If I was a longhauler away for the week and ignoring legal lenght issues I would no doubt want a US rig, probably woulden't get one since it's just not the way here, but would still want one
In the job I have now, wich requires constant squeezing into tight places never ment for trucks in the first place, from construction sites in the middle of a forest to the center of medieval cities and everything in between where visibility and a small turning circle is essential I prefer the COE I have now, it's all that would work really.
Ignoring all the boring practical shit and going by the coolness and beauty factor alone, well....I think you can guess where my heart is.