When comparing Arduino Uno R3 vs Teensy 3.2, the Slant community recommends Arduino Uno R3 for most people. In the question“What are the best development boards?” Arduino Uno R3 is ranked 1st while Teensy 3.2 is ranked 2nd. The most important reason people chose Arduino Uno R3 is:
Unlike some cheaper clones, this board is very capable of running continuously for long periods of time with no issued.
Specs
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Pros
Pro Reliable, even for long periods of time
Unlike some cheaper clones, this board is very capable of running continuously for long periods of time with no issued.
Pro Very easy to set up, even for beginners
The Teensy board is easy to set-up and start using with Teensyduino. Even beginners will have no trouble doing it.
Cons
Con Advanced users will find it's insufficient
This board is very good for beginners, but once users start getting more experienced, they'll feel that what it offers is insufficient.
Con Additional hardware is needed to connect to peripherals that are not 3.3V
This board only has 3.3V outputs, which is unsuitable to interact with several peripherals, which are either 5V or 10V. To connect to those, you need to get additional hardware.