Stress on the movement

[RBR76]

Which will cause more stress / wear & tear on an automatic movement?

a. Wearing the watch.
b. Putting the watch on a winder.
c. Manual winding of the watch.

Or there is no difference at all??

[Tools]

There's little difference, but here are some thoughts,

1. A worn watch will be subject to the same knocks, vibrations, and environment as the user.. this could be a harsh desert, or a nice office..

2. A watch on a winder is running all the time. This will continue to wear out the parts as they interact, mesh, and work 24/7. A stopped watch is incurring zero wear.

3. The entire Cellini line of Mens Rolex watches are manual wind (as were Daytonas until 1989)... they're wound every day without issue..

[Mickey®]

Agreed...and as long as you are going to service it "sooner or later"! I'd say don't worry about it...

Makes me miss my Speedmaster Moon Watch...