I find that HP/Palm Pre with WebOS was best even if we ignore the physical keyboard (sliding left/right on the touch area below the screen or on the screen with a button pressed really made it easy to select text easily and precisely). Nokia N9 with Maemo/Meego was second best but it excelled in the cards interface for multi-tasking.

Some of those were taken into other OSes but nowhere were they implemented so smoothly.

Those were the standard android buttons.