Choose a blade made of high carbon stainless steel. Some blades are forged (cast in a mold) and some are stamped or cut from a sheet of metal. Forged blades are thin at the edge and widen at the back making them much stronger than stamped blades that are thin and flexible all the way through. For this reason forging is the best and most durable method, but also the most expensive. It is possible to find stamped blades that are affordable and long lasting, but you'll have to search.
High quality knives will also have what's called a tang. This is a solid extension of the blade that runs through the handle. You want a tang that runs the entire length of the handle.
High carbon allows the blade to keep its edge and the stainless steel keeps it, well, stainless. Free from rust.
On The Edge
The part of the knife you actually cut with is called the edge and is formed by grinding. Tapered grinds are found on most forged knives. Flat grinds are cheaper to produce and, thusly are found more often on stamped blades. Hollow grinds are very sharp, but very thin and can break easily.
Get A Grip
Handles are for more than just the look of your knife. Make sure the grip is comfortable and that it's not going to slip and slide and chop off your fingers if it gets wet.
Handles can be made from wood or plastic. Certainly wood can look really nice, but be aware that, just like your deck, wood will deteriorate over time. You could even get splinters! Bacteria buildup is common as the handle starts to loosen from the tang. Plastics are super durable and, often times, ergonomically designed making them more comfortable.
Consider Yourself
The most important thing when buying a knife is how it feels in your hand. Only you can be the judge of that, but make sure the handle and blade feel balanced and that it feels macho enough to cut through everything you might want to cut with it.
