I believe with RDP, you can only mirror your Windows Dekstop, whereas with Spacedesk, you can also extend your Windows display on the tablet.
On my side, I’m more in favor of a unique machine, hence my touch enabled laptop but it is in the “visual way”, which is not good for the show, and I don’t use the touch feature that much.
I’m not in favor of yet another equipment to plug and I don’t trust 2.4/5Ghz that much.
On top of that, I envision a Cantabile Assistant (Embedded VST view). Maybe the solution for me would be to use a 10" Android tablet that extends the Windows display, over USB. I may try https://www.splashtop.com/wiredxdisplay for this purpose.
Or simply a laptop with a hinge that goes all the way to tablet mode…
So much choices, so much adaptability with Cantabile !