[tbyehl]

C3 boards are a mess, almost all of them are single-port with a USB-UART chip despite supporting USB-CDC & JTAG. Lots of C6 boards are dual-port but sometimes they're single-port, typically without a USB-UART chip. And to make it more confusing, sometimes a single-port C6 board will have a USB-UART chip that's hanging off a USB hub chip.

S3 has full USB-OTG support and most boards are either dual-port or single-port without a USB-UART chip. I dig 'em because I can put the TinyUF2 bootloader on them and get that Pi Pico experience of having them come up as mass storage.

Except for these S3 boards I bought in Arduino Uno format where the designer made every decisions as wrongly as possible — single USB, USB-UART chip, and the USB pins broken out to Arduino pins instead of using one of the optional headers they added.