If you are watching on a desktop monitor or a living room television, 1080p is the standard for a reason.
720p wins. Reason: For a 1-hour 46-minute film, battery life matters. Playing 1080p drains your battery 30% faster. 720p is smooth, small, and sufficient for a commute. Percy Jackson Sea Of Monsters 2013 Dual Audio 720p Vs 1080p
Note: For the same codec (e.g., both H.264), 1080p is roughly 2–3x larger than 720p. If you are watching on a desktop monitor