In my opinion, the most important feature in a data recovery tool is recovery accuracy and reliability, because the primary goal of these tools is to restore lost, deleted, or corrupted data without compromising file integrity. A reliable recovery process ensures that files are recovered completely and remain usable, minimizing the risk of permanent data loss. While features such as ease of use, scanning speed, compatibility, and preview options are valuable, they become less meaningful if the recovered data is incomplete or damaged. Therefore, strong recovery accuracy has the greatest impact, as it directly determines the success of data restoration and helps users regain important information with confidence.