I was Sonar only until the announcement.
After considerations I went with Cubase Pro 9.5. Spent a modest amount of time learning it. Really like it a lot. Very stable and I appreciate its features.
However, I kept noticing people over and over again had super fan boy impressions of Studio One 3.5, and when the super low cross grade offer was announced I grabbed that as well. I then also went through (and continue to go through) the learning curve.
I am presently at this mindset:
1. I have discovered it's super easy to move whole songs or just tracks from one DAW to another.
2. I likely will now start most of my new songs in Cubase. I think the Chord features are top notch and will help me be extra creative. I also think the Sampler track is way cool, but that's another subject.
3. I expect once I've got my chord structure for the whole song in a good place in Cubase I'll transfer the song to Studio One for audio and FX/mixing and other VST instrument embellishments. So Studio One will be by main DAW. As it is very well thought out.
4. If I want to use any of my outboard sound modules or sounds, I'll mix down to a single track and bring it into Sonar. Everything is wired up for my external sound modules there. If I do use any, then I can just transfer the audio and midi back to Studio One for those tracks. I won't typically have that need, but I have that ready as needed. Studio One doesn't talk with the external stuff as I had set up with Sonar. Cubase could, but it's a lot of hassle to reset all that up when it works presently just fine in Sonar.
The question at the start is what did you move to? I think I moved to Cubase, Studio One, and in a pinch Sonar.
They all work fine together to move tracks for their strong suits. I'll arrange and mix in Studio One.