I've played with the trial of Studio One, but as I am primarily a MIDI/VST instruments composer, I find it very limited compared to SONAR and lacking in a number of key areas for that side of things -
we really WERE spoiled by SONAR! For me, it is looking like Cubase is the way I'll have to go to get the level of MIDI editing I need, but still finding the workflow/UI in Cubase quite dated and not that optimised for touch/high-DPI screens - although it does seem to provide much of the MIDI editing I need. And with the use of DXshell (free) and jBridge (small cost), it looks like I
can get pretty much all of my instruments and effects running under it (there are a few still to be tested). Although the pretty awesome Cakewalk Adaptive Limiter, although it runs, is locked to running under SONAR
From what I've seen, other DAWs out there have more modern UI's including support for touch and better high-DPI support, but don't do the audio or the MIDI/VST instrument editing that well ---- and then there are some DAWs that have UIs that feel like a 10-year-old designed them
So I'm still trying them all out (takes a lot of time to do this), and still planning to run SPlat until it breaks, but feels like it is probably best to start learning Cubase, ready for in the inevitable......
.....unless anyone can suggest better options for MIDI/Instrument work! ...... or unless someone buys SONAR and gives it life again [we can hope!]
And when I've collated all the info I've found about plugin compatibility and feature comparisons, I'll probably try to post it somewhere in case it's useful for others.