Closing Recommendation
Both are giant mining shovels for the largest work, so pick by your output need, your bench and your logistics. Choose the Tata Hitachi EX 5600-7 when you need maximum production, a bigger bucket and better slope ability to move the most rock per pass. Choose the Komatsu PC5500-6 when longer reach helps you load over a distance, and when a longer undercarriage gives a steadier base on a wide, level bench, with GPS as standard. Both need careful logistics, so also confirm which brand reaches your mine fastest with service. So match the machine to your work: Tata Hitachi EX 5600-7 for top power and slopes, Komatsu PC5500-6 for reach and a stable base.