About the shape - Inspired by the profile of a traditional European chef knife, gyutos are a multi purpose knife with a slight meat cutting bias and “gyuto” even translates to “cow sword”. If you want one knife to do it all, This is it. The longer blade typically gives the blade a forward balance that allows it to work for you. While the blade would ideally by slid forward or back while cutting, they are also great for folks that prefer to 'rock' their knife while cutting.
The 240mm Gyuto is great for those who prefer a large, heavier knife.
About Masakage Koishi - These knives have been named Koishi (pebbles) for the tsuchime (hammered) and kurouchi (black) finish that give the impression of river pebbles. With the octagonal cherry wood and black pakka handle, the overall balance and feel is what chefs desire and makes it a Culinary Badass. Think Chuck Norris, but if he was a kitchen knife.
Aogami Super is the king of knife steel - super easy to sharpen, gets a laser beam edge, cuts like silk and is very rugged for its hardness. It’s called SUPER for a reason. The outer layer is stainless steel, making this knife very easy to maintain.