When assessing the price of an onshore drilling rig, you must prioritize the Nominal Drilling Depth (ranging from 1,000m to 9,000m+) and the Maximum Hook Load capacity. The drive system is a major cost driver; AC Variable Frequency Drive (VFD) rigs are more expensive upfront but offer superior precision and energy efficiency compared to Mechanical or DC drives. Additionally, verify the Mast and Substructure type (e.g., swing-up vs. telescopic) as this impacts mobilization costs and site footprint.