Difficult to have an opinion on - it varies greatly from member to member.
You could get enlightened by running a few commands
pamac list --orphans
And
pamac list --foreign
EDIT
Plasma Wayland comes before Plasma X11 and the filenames change so sddm will list the available sessions in alphabetic order - and since you didn’t change the session selection box - the first session is used - sddm always worked that way.