Any good brand should work without problems, I use 32 gig sandisk usb sticks and after formatting them to fat 32 on my PC they all work perfectly but don't use quick format always use full format. They can take some time to finish so be patient, and don't work on anything else on your PC while the stick is formatting or it will fail, stick to 32 gig or smaller, 64 gig or above will not work properly.
PS: There is no need to format these sticks on the Tyros 2, just make sure if you use your PC that you do not use " Quick Format" as this will make most brands fail on the Tyros 2!