Okay, let me clarify in the hope of some feedback. I'm producing a slideshow vid of old family photos with audio soudtrack, and I want my family (who are scattered all across the country) to be able to watch it on their smartphones and tablets with the highest definition/quality. Some have iPhones, some androids (if that makes any difference).
Using one of the MainConcept AVC/AAC presets should get you going for the iPhones. I would imagine that using those presets would create an .mp4 file that is also playable on an Android device.