save state in web player?

I want to save users playingtime,unlock hidden items…

I found two solutions in this forum so far.
one is using " CookieCutter"

http://www.unifycommunity.com/wiki/index.php?title=CookieCutter

other is us"PlayerPrefs"

Could anybody explain pros and cons about those methods?

i found answer. thank you.

http://forum.unity3d.com/viewtopic.php?t=29076&highlight=playerprefs