Studio 1 knows what track you want record to, just click on the track.
Studio 1 automatically lets you hear the soft synth you just brought up, and kills midi inputs to the rest of your midi instruments.
In Studio 1, I can select a boatload of midi notes in PRV, then go to the "start" field and mousewheel a nudge for all the notes.
In Studio 1, exporting a mixdown is simply go the Song menu, pull down to "Export Mixdown"
I don't know if Sonar Artist could do those things quite as easily or elegantly, but if so, I never found them. It was intuitive in S1.
just my .02
-Tom