Looks like Wikivoyage is a fork of Wikitravel. Not sure which one is "more up-to-date", so to speak, but usual advice related to any wiki applies.
I personally like to use Wikitravel more than any other travel guide out there, but I do double check a couple of things, just like on any other wiki.
Seems that Wikitravel is owned by Internet Brands (which also owns FlyerTalk amongst other companies). Wikivoyage forking predates the acquisition by Wikitravel, so I'm sure there must be a reason other than ensuring electronic communication liberty (i.e. away from Internet Brands).