Creating my own custom pro mini

Hello, I am creating a custom PCB based around the atmega328, and i am using the Arduino pro mini as a reference. I was just wondering if anyone knows a good quarts to use… Should it be 20mhz or should it be 16mhz?

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What clock speed options does your Arduino IDE have for a Pro Mini ?

If you use MiniCore, you can use whatever clock frequency you like. Internal as well as external.

It also depends on the voltage you want to run the 328 at, as that limits the maximum clock frequency.

The datasheet indicates that if Vcc is > 4.5V, then you can run at 20MHz. This is reduced to 10MHz if Vcc is 2.7V.