There isn't much to separate them on features:
Acer has:
+ HDMI port
Samsung has:
+ VGA port (with dongle)
+ Longer battery life
+ Brighter screen
+ Better looks
Unless you have a strong preference for a HDMI port over VGA, the Samsung is clearly the favourite. The current user base is also tilted towards the Samsung because it shipped sooner, but this shouldn't have a big effect long term.