Not the same thing. With session saving I don’t have configure anything.

KDE + wayland on Tumbleweed gave me this experience.

Wayland has at least one deal breaker for me. It doesn’t remember where my windows were at logout when saving the session. I have six virtual desktops and have specific windows in certain desktops. Putting everything back where they belong after each login, no thank you. Until they add that I’ll stick to X11.

X11 can be easily forwarded over ssh. You do need to have at least the application you want to forward installed on RPI, possibly X11 as well. You also need a X11 server on the other side.