Long-handled tools are designed to be used standing up and will cover a large area fairly quickly. Hoes are tools with a sharp edge, sometimes designed to scrape along just under the surface of the ground, like the Winged Weeder, and sometimes designed for chopping. Best for small clumps of grass, they may not have the control needed for removing grass from around shrubs and perennials. Large clumps of grass may require digging out with a shovel. Light hoes may be less durable but require less effort to use. If possible, try out a couple of types before you buy and be sure to sharpen the edge frequently.
Short-handled tools are designed to be used by a person sitting or kneeling. They give you the advantage of close contact with the weeds so you can see exactly what you're doing. Especially useful in crowded beds, they cover a smaller area than hoes with greater control but large clumps of grass may need a sharp-edged shovel. Designs include a short-handled version of the Winged Weeder, the triangular hand weeder, a circle hoe and a V-shaped scraper.
For clumps of grass, a tool with a fairly long, sharp blade has the advantage of being able to slice through fibrous roots below the surface of the soil. Depending on the length of the blade, it can remove medium to large clumps without a shovel. One tool of this type is the Japanese hori-hori knife, a substantial thick-bladed tool that can pry, dig, cut and divide perennials. Another option is a long-bladed kitchen knife from the thrift store, an all-purpose tool for cutting back thin stems, digging holes for transplants and removing grass.
Use a sharpening stone or fine file to keep your tools sharp and you'll have less trouble cutting through tough roots. To avoid losing them, take a long piece of red plastic tape and wind it around the handle. Store in a dry place to avoid rust.