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When not wearing it, it is best to put it on a watch winder.
however
You need to do some research on winders, because they are not all created equal. If you get a cheap one that, for instance, only rotates in one direction, you risk damaging the movement. Also, many cheap winders run on a continuous cycle, instead of taking timed breaks. This can wear down gears.
You would think that a company that produces watch winders would take these features (or lack thereof) into account, but this is not always the case.
If you wear the watch all the time, it really is not necessary to use a winder. If a watch is worn sporadically, a winder is probably a good idea.
If a watch is habitually left around for 15 hours, then worn for 8, then left around for 20 hours, and worn for 2, then left around for 3 hours, and worn for 12, it hurts the accuracy of the watch.
Another advantage of a winder is the way that it keeps the lubricant in the movement evenly distributed. If you leave an automatic watch unworn and unmoved for a long time, you run the risk of the oil pooling or drying out.
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