Both Italian? I fired up my Ducati yesterday. It's eerily smooth although it sounds like it should shake. There is a big difference between the 90 and the 45.
My brother is selling the V11 Sport (it's on eBay) as he prefers his Ducati. Having ridden his I can see the appeal. Revs to the moon and feels a lot lighter. But I'll stay with the Guzzi because it's a little rough and pudgy, like me.