[rjsw]

Rockchip SoCs starting with the RK3399 can do both USB3 and Ethernet.

The only board that I own that does both at the same time is the Pine64 Quartz64 that uses the RK3566. My Pinebook Pro doesn't have an ethernet port, Orange Pi 5 Max has ethernet but doesn't use the builtin controller to provide it.

[idatum]

I use NetBSD on a Pine64 RockPro64 and use USB3. It has been stable:

    awge0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
            ec_capabilities=0x1<VLAN_MTU>
            ec_enabled=0x1<VLAN_MTU>
            address: 26:80:xx:xx:xx:xx
            media: Ethernet autoselect (1000baseT full-duplex)

[nine_k]

i see Quartz64 with 4GiB of RAM offered for $60. Sounds pretty reasonable for an SBC of this caliber. I mostly mean that something like the original RPi would be underpowered for USB3.0 and 1GbE, to say nothing of smaller devices like a $15 ESP32.