I have Viking, Pfaff, Bernina and Janome machines and, if I was forced to choose just one, I would choose my Pfaff Creative Vision. I have totally fallen in love with Pfaff's IDT system.
I also have a Viking Diamond, and have found it to be the most intuitive of my machines to operate - I have rarely needed to check the manual. Mine has never had any lint problems either, even when I made and embroidered a boatload of items last Christmas.