1. Longevity
OSS, as allows modifications by any one, can survive in its current form for quite a long time. Users need not worry about lack of vendor support or feel compelled to upgrade.
On the other hand a PS is supported and maintained totally and only by the vendor . So in that case is total life is straight linked to the life of the vendor or the company, or what they chose for it.
2. Quality
As OSS is open to all hence can be reviewed by anybody and hence there are lot more chances of the bugs getting discovered and healed. As more people see the code and check it out and implement different things to it(mean additional codes) more the functionality(errors/error freeness) will be discovered.
Whereas PS are given to only a specific group of people to be reviewed and hence doesn’t have a peer review(rigorous review).
Example:
Experts and now as you also know that Linux has fewer bugs than windows and is much more stable. (http://news.com.com/Security+research+suggests+Linux+has+fewer+flaws/2100-1002_3-5489804)
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