I'm not an enthusiast when it comes to data speeds but a regular Transcend USB 3.0 should do the job if you're just watching movies off it. Especially, the full 1080p ones as it requires higher data rates than a regular 480p video.
However, if you were to race against the greatest and latest then the SanDisk's Extreme USB 3.0 is currently the snappiest of all drives on earth, you can read the full article here
IMHO, unless you REALLY need the extra speed for some particular reason, in which case you
should definitely go for it, otherwise the Transcend thumb drives aren't that bad for daily usage. But whatever you do,
just do not buy a regular Kingston(unless you have all the time in the world to transfer files). Trust me, I've regretted buying an 8GB USB 2.0 drive slower than the cheapest Transcend that simply blows it out of the water.
Happy Buying