Both the Huion GT190 and Yiynova MSP19U+ have 16:10 aspect ratio, 19″ LCD screens. From the back they’re also pretty similar, the main difference is the MSP19U+ has 8 hotkeys on the back and the Huion doesn’t.
the monoprice is basically the Huion GT 190, which is basically the Yiynova msp19. xD. And Yiynova has a new extremely well fleshed out version 3 of it, the MSP19U+, with greatly improved digitizer and changes from feedback of their two first editions.