The NXP chips have the other only open source GPU drivers, with the first being the RPi. If you want to do multi-media and need USB3, this is probably what you want.

The upboards are interesting, some have an FPGA, and some NN processing soon courtesy of Movidious.

The Pine64/Rock64 and Orange Pi are as cheap or cheaper than the RPi, and some Allwinner/Rockchip boards have binary GPU drivers, but really YMMV.