Event.EVENT vs. "event"

so i’ve just started messing around with as3, and am wondering what the pros/cons of these two methods are.

for example,
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]stage[/COLOR].[COLOR=#0000FF]align[/COLOR] = [COLOR=#FF0000]“tl”[/COLOR];
[/LEFT]
[/FONT]

vs
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]import[/COLOR] flash.[COLOR=#000080]display[/COLOR].[COLOR=#000080]StageAlign[/COLOR];

[COLOR=#0000FF]stage[/COLOR].[COLOR=#0000FF]align[/COLOR] = StageAlign.[COLOR=#000080]TOP_LEFT[/COLOR];
[/LEFT]
[/FONT]

or
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]stage[/COLOR].[COLOR=#000080]addEventListener[/COLOR][COLOR=#000000]([/COLOR]Event.[COLOR=#000080]RESIZE[/COLOR], stage_resize[COLOR=#000000])[/COLOR];
[COLOR=#808080]// vs[/COLOR]
[COLOR=#0000FF]stage[/COLOR].[COLOR=#000080]addEventListener[/COLOR][COLOR=#000000]([/COLOR][COLOR=#FF0000]“resize”[/COLOR], stage_resize[COLOR=#000000])[/COLOR];
[/LEFT]
[/FONT]

know what i mean?