Quick takeaway
DEWALT 20V MAX Cordless Drill / Driver Kit (DCD777C2) and Greenworks 24V Cordless Drill are very close in this matchup. When the overall score is tied, the right choice usually comes down to price, review depth, and which spec wins matter most for your use case.
Choose DEWALT 20V MAX Cordless Drill / Driver Kit (DCD777C2) if...
Pick DEWALT 20V MAX Cordless Drill / Driver Kit (DCD777C2) if its current price, brand, or design fits your shortlist better than Greenworks 24V Cordless Drill.
Choose Greenworks 24V Cordless Drill if...
Pick Greenworks 24V Cordless Drill if voltage and chuck size are the reasons you are shopping in this category.