It's not an either/or situation.
For beds one might also make them with enough overhang....say 4-5" on a side to cover a body (or two) in bed. Or short enough that they fit just under the fold where the pillows go, with 4-5" overhang at the foot.
I make my quilts whatever they turn out to be....fabric and patterns talk to me, don't they to you?.....and they tell me what they want to be.
Then again, I might make a "nap' sized quilt that would just cover me shoulders to feet, and fold it on the foot of the bed during awake time.
Jan in VA