In ‘htop‘ you can scroll the list vertically and horizontally to see all processes and complete command lines.
In ‘top‘ you are subject to a delay for each unassigned key you press (especially annoying when multi-key escape sequences are triggered by accident).
‘htop‘ starts faster (‘top‘ seems to collect data for a while before displaying anything).
In ‘htop‘ you don‘t need to type the process number to kill a process, in ‘top‘ you do.
In ‘htop‘ you don‘t need to type the process number or the priority value to renice a process, in ‘top‘ you do.
‘htop‘ supports mouse operation, ‘top‘ doesn‘t
‘top‘ is older, hence, more used and tested.
原文：http://relearn.blog.51cto.com/2605709/1691992