The best types of sushi are subjective and can vary based on personal preferences. However, some popular and highly regarded types include:

1. Nigiri Sushi: This is a classic form of sushi consisting of a small mound of rice topped with a slice of raw or cooked fish or seafood. Common toppings include tuna, salmon, shrimp, and eel.

2. Sashimi: Although not technically sushi, sashimi is a delicacy in Japanese cuisine. It consists of thinly sliced raw fish or seafood, served without rice. The quality and freshness of the fish are paramount in sashimi.

3. Maki Sushi: Maki rolls are made by wrapping fish, seafood, or vegetables in nori (seaweed) and rice, then sliced into bite-sized pieces. Popular examples include California roll, spicy tuna roll, and rainbow roll.

4. Chirashi Sushi: Chirashi is a bowl of sushi rice topped with a variety of sashimi, vegetables, and garnishes. It offers a colorful and diverse sushi experience.

5. Temaki: Temaki, or hand rolls, are cone-shaped sushi rolls made by wrapping nori, rice, and various fillings like fish, seafood, and vegetables. They are typically eaten by hand and provide a unique texture and flavor experience.

Regarding the best sushi in the world, there are several renowned sushi destinations known for their exceptional quality and craftsmanship. Some notable places include:

1. Tokyo, Japan: As the birthplace of sushi, Tokyo offers countless sushi bars and restaurants that are considered among the best in the world. Renowned establishments like Sukiyabashi Jiro, Sushi Saito, and Sushi Ginza Onodera have received Michelin stars and international acclaim.

2. Osaka, Japan: Known for its vibrant food scene, Osaka is home to exceptional sushi restaurants such as Endo Sushi and Matsuzakagyu Yakiniku M Hozenji Yokocho.

3. Kyoto, Japan: While Kyoto is famous for its traditional Japanese culture, it also boasts excellent sushi restaurants like Sushisei and Sushi Matsumoto.

4. New York City, USA: The Big Apple is renowned for its diverse culinary scene, including outstanding sushi. Sushi Nakazawa, Masa, and Nobu are just a few examples of highly regarded sushi spots in NYC.

5. Osaka, Japan: Known for its vibrant food scene, Osaka is home to exceptional sushi restaurants such as Endo Sushi and Matsuzakagyu Yakiniku M Hozenji Yokocho.

It's important to note that this list is not exhaustive, and there are exceptional sushi establishments worldwide. The best approach is to explore local recommendations, read reviews, and consult reputable travel and food guides for specific locations.