It's an "it depends" situation.
Traditionally, plugins (like Audio Units on the Mac) ran as part of the same process as the hosting app. I don't know if it's the same way on Windows, but that was the way it was done on the Mac.
That runs into a limitation of Rosetta: It's all or nothing. A process is x86 code, or it's ARM code. You can't mix and match.
One of the ways Apple prepared for this is that several years ago, they began pushing to have plugins run out-of-process. This introduces latency compared to in-process, but allows plugins to be x86 even when the main app is Arm.
So it comes down to:
- does Studio One Pro support the new model? One presumes so, since it would make sense to support it if porting it to be M1 native, but it's up to the developer.
- do your plugins support the new model? If I recall right, it's possible that some older x86 plugins may not be able to run in their own process.
Another (and perhaps bigger) question you will have to look into is how many of your plugins are available on the Mac, and whether you'll have to re-buy any of them to get the Mac version.