Benjamin
I Love YTtalk
YouTube Analytics = bad, poor... delay by 24 hours for most stats = SUCKS (that's my opinion, I won't use it until they'll improve it big time).
Google Analytics = Much more detailed, more options, accurate, just like I explained, so if you want more
I'm using it a few years now, but now it's much better... I do my homework, and... for now, it works for me I keep getting better results so I'm happy with it.
* Sorry about my bad English.
Youtube Analytics shows information of how many times my videos are being watched. That other analytics thing doesn't do that. When someone browses within the domain of www.youtube.com/username I get information about that but when someone clicks a video there is definitely no information.