Always look for German made knives, Germans make the best steel knives. Japanese and Chinese steel come behind Germans. Germans make the best steel, that is the reason why most hospitals in U.S use German made surgical equipments. They are of the best quality. German steel knives are priced higher than others, but quality is rest assured.
Choosing the right brand which stands behind their products is important. Top brands give you an option to return the knife if you are not happy. Don’t buy knives because they look good, I have been tricked by so many good looking ones that doesn’t add any value at all.
Always look for knives that fit in your hands. See whether the weight distribution and style matches your strength. Your hand size is an important factor, the knife that fits well in your hand may not work well with others with slightly larger or smaller hand. So don’t go with user reviews in the case of knives, it is not one size fits all. It is not a good idea to buy them online, you will have to have a hands on experience with the knife. So it is better to buy it from a store nearby.
Overall, choosing a knife is a decision that has to be taken at the personal level. It strictly depends on your hand size and usage. Always look for quality brands. It is always better to have fewer knives than a diverse range, because if you get used to one, you can literally cut everything with it, trust me.