Memory sizing — what fits and what doesn't
With 32 KB Flash you get room for a modest RTOS kernel, a few communication stacks, and application logic — think a CANopen node or a Modbus RTU slave. The 6 KB RAM handles a couple of UART buffers and a small data array; if your application needs a large lookup table or frame buffer, budget carefully.
Supply range and brown-out — keeps the rail honest
The built-in brown-out detect and POR mean you can skip an external supervisor in many designs — the MCU resets cleanly when the rail dips below the threshold, which is a nice reliability win for a single-board controller.