I think the RPi 4 is still competitive. At ~40$, Orange Pi's boards are Allwinner H618 and Rockchip RK3566 based boards. I do have an Orange Pi 3B in use because it has an nvme port, but the RPi 4 is generally faster.

The Raspberry Pi 5 and Orange Pi 5 are just too expensive. I do have some of the Pi 5s from both these companies, but have replaced them with Intel N100 mini-PCs instead. But I'll still use RPi 4's for my 3d printers and other lower-end uses.

And RPi's software support is just better: I've got an Orange Pi 4. Orange Pi hasn't updated their OS for it in years. Last time I tried to get it working in Armbian, HDMI output was (is?) broken: https://forum.armbian.com/topic/26818-opi-4-lts-no-hdmi-outp...