When comparing Tessel 2 vs ODROID-W, the Slant community recommends Tessel 2 for most people. In the question“What are the best single-board computers?” Tessel 2 is ranked 36th while ODROID-W is ranked 64th. The most important reason people chose Tessel 2 is:
Out of the box it supports Node 4.x LTS and doesn't require any setup to use it.
Specs
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Pros
Pro NodeJS support out of the box
Out of the box it supports Node 4.x LTS and doesn't require any setup to use it.
Pro Co-processor system
Runs Linux and user application code on a 580MHz Mediatek router-on-a-chip, with an asynchronous 48MHz SAMD21 coprocessor for GPIO, ADC, I2C, SPI, PWM and UART programming
Pro Programmable via USB or Wifi
The process for deploying software, whether it's JavaScript, Python or Rust, is exposed the same way for both USB and Wifi connections.
Pro Easy to get started with
The Tessel 2's "Getting Started" experience requires little more than installing Node.js and a single package (the CLI) via npm. Complete walkthroughs for Linux, Mac and Windows are available and up-to-date
Pro Software compatible with the Raspberry Pi
ODROID-W is compatible with the Raspberry Pi at least as far as software goes. It can run any software built for the Pi.
Pro Amazing heat dissipation
The ODROID-W has some great heat dissipation. From studying the heat of the heatsink, the maximum temperature registered was 37 degrees Celsius, and that was registered when the board was doing a lot of unpacking through apt-get. Normally the temperature is even lower than that.
Pro Can fit most Pi cases
Since it's built to emulate the Raspberry Pi, it's roughly the same shape albeit a bit smaller. But even then it should be able to fit most Raspberry Pi cases.
Cons
Con Very little memory
64 megabytes of RAM. This places it more in line with an Arduino style board than a SBC on the level of Raspberry Pi.
Con Obsolete
Don't fall in love, this model is no longer available.
Con No on-board Ethernet
The ODROID-W has no on-board Ethernet port available, however this can be fixed by using a docking board which has an Ethernet jack.
Con Needs a multi-USB hub
Since it only has a USB host connector available for a full-sized port, you most certainly will need a multi-USB hub to connect more than one external devices to the board.