I thought I’d informally benchmark them both given that they are of the same class but SanDisk is allegedly a more ‘reputable’ brand. I used AJA System Test on my Mid-2011 MacBook Air using the internal SD Card slot. Here is the table of results:
|Card||Write Speed||Read Speed|
|Transcend Class 10 16GB SDHC Card||13.7 MB/s||20.1 MB/s|
|SanDisk Extreme (Class 10) 32GB SDHC Card||23.8 MB/s||34.2 MB/s|
And here are the graphs:
It’s interesting to see that despite both cards being the same class, the SanDisk does come out on top, though does not perform up to the 45MB/s they claim. This could be down to file system performance or performance of the internal SD card slot, or just false advertising.
If you’re buying for a Raspberry Pi, it probably won’t matter what card you get. However if you’re buying for a digital camera or camcorder, you’d be better off going with the SanDisk Extreme. Even the 16GB SanDisk Extreme is only £3 more on Amazon.