EFR32MG24A021F1024IM40-B: Ultra-low-power ARM Cortex-M33 core, 1 MB Flash, Thread + BLE 5.3, rich security features—ideal for battery-powered IoT.
STM32WB55CCU6: Dual-core Cortex-M4 + M0+, 512 KB Flash, supports BLE 5.3, Thread, Zigbee—best if you prefer the ST ecosystem and extensive peripheral set.
Which one would you like to include in your schematic?