There are certain areas where Cubase was ahead of Sonar, but overall as a product for what it could do, nothing compared to Sonar. There is not another DAW on the market that can do what Sonar did, and be as integrated with Windows. The one big knock on Sonar was there were still a lot of bugs, so not everything was flawless.
I do like Cubase's channel strip and it's the closest thing to pro channel that I've found out there. Studio One follows the Pro Tools model that everything is inserted in a plug in bin. Cubase also has some of the nicest sounding EQ's and compressors out there. I'm not a big fan of the sound of Studio One's plugins. To me they sound very dull and processed.
What drives me the most crazy is the fact that both Cubase and Studio One's UI is so Apple centric. No full screen mode for Windows. I have to use Auto Hide on the task bar, to go full screen on my laptop. And the stupid archaic top menu driven interface that Windows got away from since Windows XP, but just seems to be built into Apple.
I secretly hope that Microsoft or somebody picks up the Cake IP and runs with it, but I'm not holding my breath, so I've decided to move on. There are something I really love about Cubase, scoring being the no. 1 thing, but I won't lie that I miss Sonar. I've had Studio One pro for a while and just used it for cross compatibility for my church's all Mac shop, but I always got better results with Sonar. Studio One has a slick interface but it is a very immature product and it's sort of like Google Docs, they just give you enough of what you need, but when it comes to the meat and potatoes it really lacks.
One of the best new DAW's I've seen is Bitwig studio, and if it had more features that would probably be the DAW I would use. The workflow blows Studio One away and the developers work very close with Microsoft so it's not so damned Apple centric in it's design.