Due date accuracy?

Raven
Do you all think the lmp edd is most accurate, or the due date the baby is measuring at? Its about a month's difference between mines so im now getting on the weekly monitors, but im anxious to know when my little guy might make his arrival. Lmp has him due March 2nd but on the scan he's measuring at February 8th! He was already a 5 pounder on dec 21st. Your thoughts?