Those kensingtons are pretty good. There isn't a "best" in my opinion, once you discard the crappy stuff. All laptop locks are "universal".
I think that one you pointed out is one of the type that you can set the combination. I've broken a couple of those by using the friction-testing method, for people who had set it wrong. I don't know if key locks are any better, what with the big stink about the Kryptonite bicycle locks.
I think that laptop locks are only good protection if you are only leaving it alone for five or ten minutes. I would not leave a laptop alone in a public place for more than that even with a lock.
Edit: Kensington locks for $4 cheaper at newegg.
http://www.newegg.com/app/ViewProductDe ... 618&depa=0