Naturally this is only my opinion based on a limited subset of UMPCs which I have tried.

When I started I hadn’t received the Sony VGN-UX380N yet, but it had always fascinated me. Upon seeing it for the first time I thought Wow!, it is smaller than I’d expected. The 4.5 inch screen is bright, but I definitely need to try increasing the font size and lowering the screen resolution to make it more readable. I don’t remember than problem so much on the OQO Model 01 I tested, nor on the Fujitsu U810 LifeBook. The Asus R2H UMPC doesn’t really count since it has a 7 inch screen, compared with the OQO Model 01’s 5 inch screen and the U810’s 5.6 inch touchscreen. Okay, the others all have bigger screens!

The layout of the keys on the Sony VAIO VGN-UX380N’s keyboard is closest to a standard keyboard layout. Unfortunately the keys don’t have enough tactile feedback. The U810’s keyboard does some unexpected sharing of keys, but is closest to typing on a regular notebook. The OQO is quite amazing because of it’s size and how well it functions as a regular PC. It also has a really neat way to check the battery charge without turning it on. Pressing an unobtrusive button on the underside of the OQO lights up row of small lights, giving you a quick visual indication of the battery’s charge.

Choosing the best one is hard. The dual clamshell notebook/tablet PC configurations of the Fujitsu LifeBook U810, along with it’s general ease of use narrowly gives it the edge. So the Fujitsu LifeBook U810 narrowly beats out the Sony VAIO VGN-UX380N.