Both often have AAC 2.0 or 5.1. No major difference unless the 1080p release includes higher bitrate audio (rare for Indonesian films of this era).
A clear explanation of what the 'p' in 720p/1080p stands for (progressive scanning) can be found at HowStuffWorks Optimizing for Big Screens Lenovo's Glossary sang pencerah 720p vs 1080p
discusses whether 720p is sufficient for modern projectors and immersive 3D viewing. Both often have AAC 2
The debate of Sang Pencerah 720p vs 1080p is won by answering two questions: And how far away are you sitting? sang pencerah 720p vs 1080p