I like the Scania, especially the NG S series. But the Volvo FH16 comes in second.
I like the Scania because of the big V8 engine, nice front grille and nice interior that's modern. The Volvo is also good with its 750 engine, but the interior on the Scania looks better to me. I just don't like the white interior as much as the V8 Exclusive interior on the Scania, so that's why its higher on the list.
They are both very good trucks though, and I do drive both of them and swap between them often.