As with most things.........lot's of different opinions on what works best.
I guess it's what you personally feel comfortable with. For me it's the chain on the seat as in JohnnyBoxer's ( and many thanks for photos).
Mainly because it looks safe enough and I know I will use the chain.
I have a disc lock for short stops, but for overnight I just feel better with the chain even though I know it's not foolproof.
That is my take on it too, chain bike every time if the bike isn't garaged
Many folk don't even use the hotel garage, even if available or offered ............which surprises me
Out of sight, out of mind is the old adage - so I always garage, if possible.........no matter how tired I am
Plus if it's raining the bike and accessories stay dry too