I am not entirely sure that the seats are noticably wider, and I find the lack of headrest on most scoot seats somewhat uncomfortable. But personally I would take Scoot In Silence seats (extra legroom + adjustable headrest + passengers not wanting to pay extra mean these are less likely to be full) or ScootPlus seats anyday o

If you want an indepth discussion on the merits of Scoot, there is one here:
Hints and Tips when Flying with Scoot