|InnoDisk USB Card (left) alongside the Transcend JetFlash 500 (right)|
Ubuntu's Disk Utility benchmarking feature will wipe the drive (required for write test) so good thing the JetFlash is brand new. The InnoDisk is what I use for Ubuntu bootable USB keys so wiping it isn't much of a problem.
The InnoDisk appears to perform rather consistently. That's a good thing, of course. Strangely, the Disk Utility detects it as a "Generic USB Disk".
|Transcend JetFlash 500 benchmark|
I've only ever owned (and benchmarked) these two USB disks, so it could be Transcend is just a budget brand. Still, the InnoDisk has been around a long time so there's expectation that even a budget brand could at least be a little better than a much older device.