I run Project 64 and an PSX emulator on my Dell Mini 9. The emulators run fine. I use a gamepad with dual analog sticks as a controller. It's a good setup, but not quite as portable as the Pandora is.
I'd go with the Dingoo. Its support for more video/audio (Flac!) files than the Wiz make it better. The button layout looks better than the Wiz's. It also has an FM radio.