The pair also has a diverse offering of operating systems. The Samsung Infuse 4G has Android 2.2 on board while the HP Veer 4G is the third webOS handset following the Pre and the Pixi. The version of the OS on the Veer is webOS 2.0.
So regardless if you have big or tiny hands, AT&T has a new smartphone for you that will fit your palm perfectly. And that is the, uh, long and short of it.
source: AT&T (Infuse 4G), (Veer 4G)