Determining the "best" samurai sword maker is subjective and can vary based on individual opinions and preferences. Additionally, the art of traditional Japanese swordsmithing is a highly specialized craft that requires years of training and expertise. Several modern swordsmiths have gained recognition for their skill and craftsmanship in producing high-quality Japanese swords. However, it's important to note that traditional Japanese sword making is a niche and exclusive field with a limited number of skilled practitioners.

Some prominent contemporary swordsmiths known for their exceptional work include:

1. Yoshindo Yoshihara: Regarded as one of the most accomplished swordsmiths in Japan, Yoshindo Yoshihara has received numerous accolades and recognition for his skill and artistry. He comes from a long line of swordsmiths and specializes in creating both modern and traditionally inspired Japanese swords.
2. Miyairi Akihira: Miyairi Akihira is a highly respected swordsmith who has earned a reputation for his meticulous attention to detail and traditional techniques. He is known for producing swords that meet strict historical standards and exhibit exceptional craftsmanship.
3. Gassan Sadatoshi: The Gassan family has been producing swords for several generations, and Gassan Sadatoshi is a prominent swordsmith of the current generation. He is known for his ability to create swords that combine traditional craftsmanship with innovative designs.
4. Shoji Kume: Shoji Kume is a master swordsmith who has dedicated his life to perfecting the art of Japanese sword making. He is known for his focus on traditional methods, using authentic materials and techniques to create swords of exceptional quality.

It's worth noting that acquiring a sword from these renowned swordsmiths can be challenging and often requires connections or involvement with established Japanese sword organizations. Moreover, due to the limited number of skilled swordsmiths and the time-intensive nature of sword making, the availability of swords from these craftsmen is typically limited.

When considering the purchase of a Japanese sword, it's crucial to consult with reputable dealers, experts, or sword organizations to ensure the authenticity and quality of the sword.