What is the difference between "group.execute" and "group.move"?

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I LOVE ROS

Hi, I have two options to move my robot with MoveIt:

Option 1

moveit::planning_interface::MoveGroupInterface::Plan plan;
kPyGlobals.move_group_end->setJointValueTarget( goals );
kPyGlobals.move_group_end->plan( plan );
kPyGlobals.move_group_end->execute( plan );

Option 2

kPyGlobals.move_group_end->setJointValueTarget( goals );
if ( syn == Synctype::SYNC )
    kPyGlobals.move_group_end->move();
else if ( syn == Synctype::ASYNC )
    kPyGlobals.move_group_end->asyncMove();

Normally I use option 1 because I want to use the created plan for later.

But what is the difference between these two options?