Pat, I started with Cakewalk Pro Audio 8 and had all the Sonar Versions. I first got Studio One Pro V2 and have been with them ever since. The speed and ease of the drag and drop sold me right off the bat. I too also use Presonus hardware including the Fader Port. As others have stated it has tight integration with the software and hardware.
I own Melodyne Studio which is also tightly integrated with Studio One. In fact Presonus co-developed ARA with Celemony which even Sonar and others also use.
Studio One is cross platform which I own a PC and a Apple iMac and releases at the same time.
As Matt mentions it also works with it's Notion notation software.
Some of the features I like is the Arranger track, Chord track, The Scratch Pad, Lyrics Track.
One particular feature I like is just being able to drag over a effect on a send and it will setup and create everything for you including a aux track.
Another feature that is cool if drag and drop a Virtual instrument it will create everything for you and if you drag another on top of that one it will ask you if you want to combine them or replace the other one. This also works with effects. You no longer need to use a separate track for parallel compression just drop another compressor and make a splitter. They have features for doing live shows, beat making ,video and the list goes on and on.
I do have other DAWS including Logic, Reaper and so on but by far my favorite is Studio One.

BIAB 2025 Ultrapack- Studio One Pro 7 Windows 11, Mac Mini M4 with Logic Pro 11, Melodyne Studio