RE: I took a Viking and a Scenic cruise last year and I thought the Viking was more upscale. Depends on measurement criteria, and cabin booked. And cost!"
And I've taken 2 GCCL (Grand Circle Cruise Lines) and 3 AMA river cruises and didn't see much difference, outside of GCCL was about 1/3 the cost! And only has twin beds. They save by not using travel agents and by not advertising (except to past guests ) and pass those savings onto guests.