The choice mainly depends on the sharpening angle and how you use your knives. The Trizor XV CC15 is ideal if you want a fine 15° edge or wish to convert traditional 20° knives to 15°. The Angle Select 1520 is the most versatile option for users who want to maintain both 15° and 20° knives. The Hybrid 270 is designed for 20° class knives and combines electric sharpening with a manual finishing stage.

A 15° edge is finer and creates less resistance when slicing, which is why it is commonly associated with Japanese-style knives and precision cutting. A 20° edge has more steel supporting the cutting edge and is traditionally used on many European and American knives, especially for heavier cutting tasks. However, modern knives do not always follow this rule, so checking the manufacturer's original angle is recommended. 

Many Japanese knives such as santoku and nakiri models use approximately 15° per side, but not all Japanese knives are identical. Some may use different geometries or even a single-bevel edge. When possible, check the knife manufacturer's specifications before sharpening.

Traditional European and American kitchen knives were commonly sharpened at around 20° per side, although many modern European manufacturers now use finer angles closer to 15°. If you want to preserve the original geometry, check the manufacturer's recommendation. The AngleSelect 1520 is particularly useful when you own knives with both angles. 

Yes. The Trizor XV CC15 is specifically designed to reshape traditional 20° edges into a finer 15° Trizor XV edge. Its three-stage system progressively shapes, sharpens and polishes the blade while creating a triple-bevel geometry designed to combine sharpness with durability. 

Each stage performs a different operation. A first stage generally reshapes or establishes the edge, the following stage refines and sharpens it, and the finishing stage hones or polishes the cutting edge. On the Trizor XV CC15, for example, Stage 1 shapes the blade with diamond abrasives, Stage 2 refines the edge and Stage 3 polishes it. Multi-stage sharpening also creates a supported, arch-shaped edge rather than a simple single bevel. 

No. The coarser sharpening stages are mainly useful when a blade is very dull, damaged or when its geometry needs to be recreated. For regular maintenance, fewer passes or simply using the finer finishing stage may be sufficient. This reduces unnecessary metal removal while restoring cutting performance.

Several models in this range can maintain serrated blades, including the Trizor XV CC15, AngleSelect 1520 and Hybrid 270. Serrated knives are generally sharpened using the designated finishing or polishing stage rather than the coarse reshaping stages. Always follow the instructions for the specific model. 

There is no fixed schedule because sharpening frequency depends on how often the knife is used, the steel, the cutting board and the type of cutting performed. Rather than sharpening automatically every week, sharpen when you notice a clear loss of cutting performance. Chef's Choice notes that professional chefs may sharpen every few weeks, while normal household use generally requires less frequent full sharpening.

The diamond abrasives are designed to sharpen efficiently, so only the amount of material necessary to recreate the cutting edge should be removed when the machine is used correctly. The coarse stages should therefore not be used unnecessarily for routine touch-ups. Chef's Choice also uses precision guides to maintain a consistent angle and reduce guesswork during sharpening. 

Yes, but you need a model designed to handle both sharpening angles. The Chef's Choice Angle Select 1520 is the most versatile option, as it includes dedicated guides for both 15° Japanese-style edges and 20° European-style edges. The Trizor XV CC15 can also be used on European knives, but it reshapes them to a finer 15° edge.

Yes. One of the main advantages of Chef's Choice electric sharpeners is their integrated angle guides, which help position the blade correctly during each pass. This makes sharpening much easier for beginners than freehand methods, while still delivering consistent and repeatable results. The key is simply to follow the recommended sharpening stages and avoid applying excessive pressure.