There are many Arduino “shields” out there, i.e. boards which fit on top of the Arduino Uno and compatibles. Even for one-off prototypes, it may make sense to use this form-factor, as it allows you to re-use a setup with a different µC board underneath (but watch out for 3.3V/5V issues!).
This could be convenient with STM’s low-cost “Nucleo” boards - letting you switch to a different µC if the current one runs out of steam, or doesn’t have all the needed peripherals after all.
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