The diagram here presents the evolution of cutting tools used in ancient times. At first glance, it is visible that the tool has three sides: front, side, and back; it is five centimeters in length. The above image shows a tool made 1.4 million years ago, and the picture below it shows a tool made 0.8 million years ago.
It can be observed that the older tool among the two (tool A) seems to be much thicker from the side view for better grip. On the contrary, tool B is thinner. Tool A is polished, with uniform edges and a blunt top. However, tool B is lacking in finishing quality as it has several rough edges. In terms of design and aesthetics, tool A has better ergonomics and a smoother surface.
Overall, the length of both tools is the same. Tool A provides a better look and feel, but it may underperform in front of tool B, as it has sharp edges and a spiked head for better cutting. Tool B is made for performance-driven purposes.