Closing Recommendation
Both are capable graders, so decide by the roads you work on. Choose the Komatsu GD705-5 when you build long highway stretches or large site formations where a longer blade and more power cut the number of passes, when you work embankments and slopes and want steering that keeps working if the engine stops, and when there is room to turn a big machine. Choose the SEM 917F when your work is village roads, canal banks and confined sites where a tighter turning circle saves constant reversing, when load-sensing blade control helps your driver hold a clean level and camber, and when lower running cost suits smaller contracts, remembering to price in GPS if you need it. So match the machine to your work: Komatsu GD705-5 for long, wide, powerful road building, SEM 917F for tight roads and fine blade finishing.