Depending on your needs, there are a lot of alternatives now. Orange pi or rock boards are fairly similar but much more powerful than the rpi. However they don't compete in the pi zero class, they compete with the higher spec pi boards (4b). If you want a pi zero competitor, I'd suggest the esp32-s3 based boards such as the lilygo t display s3. There are a lot of other options, these are just some that I've used.