What are the differences of ATMega328 ATMega328P and ATMega 328PB?
Compare the data sheets. There are many, many differences, especially between the latter two.
This is good practice for reading data sheets, which is required to fully appreciate the hobby.
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Microchip/Atmel wrote a Application Note about the differences between the "P" and the "PB"
Keep in mind there are a few (minor) pin differences, which is why I just made my own PCB for the "PB".
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The difference between the 328 and 328P is "picopower", which might mean lower power consumption in powerdown modes, but the only visible difference is the ability to turn off brown-out detection in software.
The 328PB should have been a different part number 
. It has extra I2C, SPI, and UART peripherals, two additional 16bit timers, the ability to use what were analog-only pins for digital IO, removes a set of power pins, has a unique serial number, clock failure detection, more explicit support for Touch IO, and isn't available in DIP. And the PB is cheaper.
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Will do!
Thanks!
Wow!
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