Mega has a crystal oscillator and Uno has a ceramic resonator. Mega works with any other compatible shields while Uno is not compatible with the shields. Uno does not have FTDI USB to Serial driver chip and hence it uses ATMega 16U2 that can work as a USB-to-Serial converter. The components of Mega and Uno differ from each other.When the program is up and running, the variables can be created and manipulated in Mega due to its SRAM space while it does not happen in Uno. Uno has 2kB SRAM space while Mega has 8kB SRAM space in the system. Static Random Access Memory is used in Arduino systems.If the code is large, it is better to go with Mega due to the memory. Mega has a flash memory of 256kB while that of Uno is 32kB. Both Mega and Uno have a clock speed of 16MHz but the memory and storage space is different. Both come with a through-hole to fit into the system. Among the digital pins, 15 have PWM in Mega and 6 in Uno. Uno has only 14 digital pins and 6 analog pins. There are 54 digital pins used and 16 analog pins used in the system.
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