I've been eyeing the Xteink Reader but cannot decide between the X4 (4.7" diag) and X3 (3.7" diag).

FWIW, the X3 requires a pogo pin cable, while the X4 requires a standard USB-C.

Anybody got any recommendations?

Thanks!

I picked the X4 over X3 because the usb-c is convenient for charging (which you barely need to do)

I love it and use it every day.

Go for the X4. Neither supports USB file transfer, so having USB-C charging is convenient without additional things to worry about. Bigger screen is also better if you're a fast reader. The faster you read, the more your reading speed is limited by the page turn speed.

The X4. I always have a USB-C cable handy; so, i can charge it in the bedroom, at y desk, etc.