Transcend RDF9 USB 3.1/3.0 UHS-II Card Reader
You aren’t likely to find a better option if data speed is your primary concern, as this pick uses a USB 3.1 interface for the best rates possible. However, this is only a real advantage if you have a USB 3.1 port on your computer, so keep that in mind. This car reader is compatible with many different Windows operating systems, Mac OS 10.2.8 or later, and Linux 2.6.30 or later. The biggest drawback with this device is it doesn’t support quite as many different cards as some other models. You get support for SDHC, SDXC, both microSDHC and microSDXC cards, CompactFlash, and memory sticks. Unfortunately you can’t use this model with a miniSD card or some other types, so this is something to consider if you tend to use a wide range of different memory cards. Although this memory card reader has some limitations (especially regarding the types of cards it accepts) it's one of the fastest models on the market.