destroy outside layout behavior vs outside layout condition

Should the behavior always be used to destroy an object outside the layout?

Is it more efficient than an event check or just a way of reducing clutter on event sheets?

thx

Completely up to you, and there should be absolutely no discernible impact in terms of efficiency or performance.

Events give you more control, should you require it.

You can also use includes to organize event sheets and get rid of clutter as an option.