I've been using Teensy processors from PJRC.COM for about 7 years and before that I was doing Arduino projects with Arduino Uno. Typically use prototype boards like the ElectroCookie solder breadboards to create a microprocessor with a large number of connection points. I'm either doing it to experiment with the microprocessor spawning various specific sub-functions or maybe for a specific design. If I change my mind, I can remove the microprocessor and all devices attached to it and swap to a different board. For example, I'm currently focusing on Teensy 4.0. I want to have a board with standard Teensy 4 pins (14 pins on each side) + breakout board to access bottom solder pads (10 more pins on each side), two separate SPI connections for two different displays (10 pins for each SPI connector, one on each side), an I2S audio output connector (8 pins on one side), an LED block that I can connect random pins to for the debugger (8 pins on one side), a voltage converter for non- Pixel lights (8 pins on both sides). So you need a lot of contacts for that. ElectroCookie makes 2 boards that can handle larger designs like mine (large board with 2 groups of 63 pins and 4 rows of power lines and a 2 column board with 4 groups of 30 pins and 6 rows of power lines). This review is about a large circuit board. I haven't used the ElectroCookie PCB at this point, but I'm impressed with it. The large ElectroCookie board mates well with the full size Adafruit Perma-Proto board (2 groups of 60 pins and 4 rows of power. Like the Adafruit board and unlike many other boards, the ElectroCookie board is double sided. This means, that you can solder connections on either side of the board. I often do this by having female headers where I plug the components to one side and the wire that makes the connections is soldered to the other side. ElectroCookie has a few features which makes it better than the Adafruit board IMHO It's easy to connect the power rows with a small wire soldered in. On the Adafruit board you need to run two much larger wires through the boards to connect the power and ground lines on each side Let me use the stands to lift the board off the ground, this increases stability and prevents accidental short circuits.
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