sharke
I'll go out on a limb and suggest that Reaper does a lot more than Sonar and is a superior DAW in almost every way.
Universal statements assume people all use something in the same way, which they don't. For example, try creating a loop library that will stretch in other DAWs with Reaper. There's no matrix view, which regardless of whether it's underutilized or not, is a valuable songwriting and improvisational tool. No DSD import or export for your Japanese clients. No tempo extraction from freestyle playing. No upsampling, which is sooo much easier to do in Sonar than any other program. I'm not sure if Reaper has FX Chains but those are extremely valuable additions to both Studio One and Sonar.
Sonar is also a more complete package - people who don't have the money to invest in lots of plug-ins will welcome features like the QuadCurve EQ (once you learn what those four curves can do, it's very difficult to obtain the same results in other EQs), TH3, Melodyne, Blue Tubes, phase-linear EQ with mid/side options per node (I know you can use ReaFIR as an linear-phase EQ, but it's clumsy and AFAIK doesn't offer mid-side processing), etc. I don't think those who want a complete package would dismiss them as just "goodies" but rather, see them as essential tools. Rapture Session also comes with some very useful sounds.
I know Reaper is going to have ARA integration at some point (maybe it already does, I dunno), but Studio One has had it since 2011 and Sonar since 2013 IIRC.
Now, maybe these features mean nothing to you. However, I would never say Sonar is superior to Reaper in "almost every way" just because Sonar has features I need and Reaper doesn't. Similarly, there are features in Studio One and Live that neither Sonar
nor Reaper can touch. Try mastering an album in Reaper compared to Studio One.
The reason why there are so many different DAWs is because different people have different needs. I'm really tired of this whole "my DAW is better than your DAW" sports team mentality. People should just use the DAW that's most congruent with their needs, and make music with it.