More important than a polished prototype is to first polish your skills with regard to your ability to generate and communicate ideas.
Once you have accomplished this then you must figure out who is your audience. Crafting a pitch without an audience in mind is like addressing a love letter, "to whom it may concern".
With regard to the technical execution of your pitch, below is a link to some of my pitch videos. The audience of these pitch videos vary and therefore so does the style of the pitch.
Once you have decided who is your audience and have reviewed my pitch videos, schedule a call with me and I can help you craft your pitch video that will best trigger your investor hot buttons given your specific variables and situation.