It is difficult to determine the best aloe vera gel in the world as there are many great brands available in different regions. However, some of the top-rated aloe vera gels are:

1. Amara Organics Aloe Vera Gel - This gel is made from 100% natural ingredients, including organic aloe vera, witch hazel, and vitamin C. It is known for its healing and moisturizing properties, making it a popular choice for people with dry or irritated skin. The gel is also free from parabens, sulfates, and other harmful chemicals, making it a safe and gentle choice for all skin types.
2. Lily of the Desert Aloe Vera Gel - This gel is made from organic aloe vera and is free from preservatives and additives. It is known for its cooling and soothing effect on the skin, making it a great choice for sunburns, insect bites, and other skin irritations. The gel is also rich in vitamins, minerals, and amino acids, which help to nourish and hydrate the skin.
3. Nature Republic Aloe Vera Gel - This gel is a popular choice from Korea and is known for its lightweight, non-sticky formula. It is made from 92% organic aloe vera and is great for all skin types, including sensitive skin. The gel is also infused with green tea and bamboo extracts, which help to soothe and hydrate the skin.
4. Fruit of the Earth Aloe Vera Gel: This gel is made from 100% pure aloe vera and is free from fragrance and color. It is known for its healing properties and can be used to soothe burns, bites, and other skin irritations. The gel is also non-greasy and absorbs quickly, making it a great choice for daily use.
5. Seven Minerals Aloe Vera Gel: This gel is made from organic aloe vera and is free from parabens, sulfates, and other harmful chemicals. It is great for all skin types, including acne-prone skin, and can be used for face and body. The gel is also enriched with seaweed extract, which helps to promote healthy skin.

When choosing an aloe vera gel, it's important to look for products that are made from natural and organic ingredients, free from harmful chemicals, and suitable for your skin type. It's also important to read reviews and do research on the brand before purchasing to ensure that you're getting a quality product.