i was hoping for the tech point of view i konw your taste already from post before in others forums mostly in retro games and develop, thats why you need a clamshell one for the keyboard , because everybody like to make assumption in this kind of device portable PC.
i will like to give some credits to peoples, groups and companies, that are willing to make this type of idea possible like, Pyra-Pandora, GPD, LinkVision,Sony with PSP Vita,JXD and the Smach team.
I did not know nothing about the Pandora device,but to me is like the most solid one beside to be old, and i think everything starter with this and Sony PSP Vita for the mass for a small screen, correct if i am wrong. GPD and Smachteam are the firts one to use Intel and AMD technology.
i like this type of device without keyboard, because it is just for casual or occasional game or gamers like me for two hour play at the most.