I stopped by WikEmacs today to see how the site was progressing. It looks pretty nice and has obviously seen some hard work by its contributors. Being me, I immediately went to the Emacs Lisp Cookbook to see how it looked. It's pretty much the same as the EmacsWiki Elisp Cookbook but a little better formatted and with some of the material rearranged. So while there isn't much new material it is nice to see that it's migrated to WikEmacs.
I don't take a stand on whether one site is better than the other; I'm just happy to see more information about Emacs collected together wherever folks feel most comfortable contributing. If you haven't checked WikEmacs out lately, drop by and see what you think.