I just reread all of this thread, and I have my preferences, but there are so many combinations,that it is not easy to make a general statement.
It all depend what your options are,some times there is only one.
Me as a single shirtmaker I have 6 options for sewn in linings and about 5 for fused .
Also for the my default top collar is a combination of the two processes .
I will never fuse the band and almost never fuse the fabric of the top collar, but I use fuse a ...