Well honestly so far it's all the little simple stuff. I like the UI better, and how the mouse scroll wheel serves different functions depending on the context. All the simple plugins replace stuff that's bulky, awkward and hard to use in Sonar (like AudioSnap). The way you can create track folders instead of having to bus everything. The FX bins with multiple folders, and a search functions for VST plugins (which was fucking horrible in Sonar, having to scoll for a whole two minutes every time I want something further along alphabetically, like Rverb, Rvox, etc.). Zooming in and out of your audio clips in Sonar was clunky as hell, especially if you had all your plugins floating at the bottom of the screen (which I found sometimes useful, but I couldn't seem to be able to get rid of them.). Plus, it's 60$.
So yeah, it's probably honeymoon phase for me right now, and I'll post back when I have problems with Reaper, but so far it's a definite win for Cockos.
::Edit:: Oh, also, the rendering windows is a LOT better. If you want to render to MP3 in Sonar, you have to download LAME, obviously, but you have to input different settings for bitrate and everything, and save that in a config file for Sonar. In Reaper, there's LAME functionality built-in that allows you to change those settings in the Reaper interface and easily make presets.
