Among the 3 devices I had, I'd say the nexus 10 was the fastest to get updates, but it did so later than other 'newer' Google devices (e.g nexus 7, nexus 4).
As for the other devices, several times, the much longer delays were officially explained as being the fault of HTC/Samsung.
I still think google devices are a better choice but the faster updates are largely a myth.
Hmm, how are faster updates a myth? Samsung Galaxy devices don't run Lollipop still, months after release. Most Samsung tablets won't run anything newer than Android 4.2/4.3, even if they were released in 2014.
I guess we are playing with words here. A specific google-device will have its OS update earlier than a similar non-google-device. Catch is, more recent google or non-google devices usually get the update earlier.
Google would like you to believe that you will get your update as soon as a newer version has been released, sort of in an Apple IOS update way. The reality is very different.