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If you buy the rpi3, also buy a class 10/UHS 1, I recommend san disk ultra or extreme. All lower speeds are wasted on a quad core Cortex-A53.

When developing you will need to do lots of r/w operations like opening a configuration file in an editor, writing this file in the editor etc. With slower SD-cards all these will take longer, and you will want to change your files a lot.

As for the read/write/class-speeds, do not take them seriously. Search the internet for benchmarks instead. Most vendors define the speed for sequential write or read, that is e.g. writing e.g. a video block after block. On a computer (rpi3) you do mainly random read/writes: Read a file from /etc, next a lib from /lib, which are located in different locations of the sd.

If you buy the rpi3, also buy a class 10/UHS 1, I recommend san disk ultra or extreme. All all lower speeds are wasted on a quad core Cortex-A53.Cortex-A53. I recommend san disk ultra or extreme.

When developing you will need to do lots of r/w operations like opening a configuration file in an editor, writing this file in the editor etc. With slower SD-cards all these will take longer, and you will want to change your files a lot.

As for the read/write/class-speeds, do not take them seriously. Search the internet for benchmarks instead. Most vendors define the speed for sequential write or read, that is e.g. writing e.g. a video block after block. On a computer (rpi3) you do mainly random read/writes: Read a file from /etc, next a lib from /lib, which are located in different locations of the sd. sd.