I'm working on a small project that require computer vision boards. As many as possible. Wifi ability is not necessary, I can get ESP8266-01s with a dollar.
OpenMV is too expensive and not easy to deploy. Rasp Zero W is OK, but my board stopped functioning three day after I bought it. I'm now using Nanopi Duo2, have issues installing miniconda, but it is the best choice I know.
I tried ESP32-CAM a year ago, but it seems impossible to use python on it.