While I won't take the flame bate you so blatantly cast (you could read what you wrote, swapping 'physx' for 'havok' and it would be equally irrelevant) I would say that NV's swaying power with developers is not to be sniffed at, as they've proved on multiple occasions.
Whether they're
fair in all their dealings is another discussion
Arguing which API is currently 'the best' is pretty pointless:
http://www.havok.com/content/blogcategory/29/73/
http://physx.cwx.ru/
Both have an impressive library so far.
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