Preparing vegetables in the kitchen can be a chore, especially with a blunt knife that's not built to get the job done. If you're serious about quality knives then an usuba or nakiri knife are both excellent options. They're Japanese knives that are designed to make cutting, slicing, and dicing vegetables simple.
Although the nakiri and the usuba look quite similar at first glance, they have differences which you need to consider. Your knife skills, ability to maintain a sharp knife and budget are just a few of these considerations. This infographic from cuisinevault.com compares and contrasts the two knives and gives advice on which may be best for you.