I have three projects in progress and chose AVRs. Part of it is the voltage flexibility that dragontamer mentioned — two run off USB power and include 5V SPI L

I have three projects in progress and chose AVRs. Part of it is the voltage flexibility that dragontamer mentioned — two run off USB power and include 5V SPI LEDs, and one runs off unregulated 3×AA. The other part is simplicity and directness — I can just write *PORT=0x42 rather than rely on some vendor BSP that doesn't address my use case and will be deprecated next month.