Cubase has been my primary DAW for many years now, but last year when Studio One release 5.3 with Sound Variations automatically integrated with the Synchron Player I was interested, given that Cubase has not in recent years done much of anything to upgrade or add the features I cared about the most (one being the tedious user interface for expression maps). It was precisely the simultaneous crossgrade offer of about $200 that enticed me to leap. Without it I would not have done so.
I consider myself to be rowing a boat with two DAW oars for the present.
I doubt it would be accurate to say Studio One has become the DAW of choice for VSL users. But I would guess that the percentage of it's users, though smaller relative to Cubase and Logic, is definitely growing.
If you don't already, you could frequent the VI Control forum section labelled "Your DAW" to get a good feel for what new Studio One users think.
Synchron - Woods, Brass, Perc I, Str Pro, Elite Str, Duality Str & Sordino, Prime Studio - Woods, Perc, Solo Str, Ch Str, Orch Str, App Str, Harps, Choir Studio Dim - Brass, Strings VE Pro, MIR Pro 3D, Vienna Suite Pro Cubase 14, Studio One 6, Dorico 5