Dilemma?

A dilemma I have with the scene I am filming is the moment to have the flashback shown. I am unsure whether to have it on the TV as they watch it together or whether to show it when one of the characters picks up an object form that day in which the memories are shown. As the sequence was filmed on the beach i decided to use shells as a connection to the memories and use them as the objects which remind the characters of the day they had. I am going to put an effect on the footage so that it looks like memories. This will be done whilst editing and I will add music to the background to make it more emotional. 

If I decided to have the flashback on the TV I would have to make the flashback I have edited onto a DVD and then show it on the TV. However if I decide to have the flashback when a character picks up an object this would be easier in order of filming and editing. I will have to change my storyboard and think more about the reactions of the characters and how i will end the scene.