The best Osmanthus variety is the 'Goshiki' Osmanthus. This variety stands out for its vibrant yellow and white flowers, which are highly fragrant and have a unique, sweet scent. The 'Goshiki' Osmanthus is also known for its ability to bloom twice a year, making it a popular choice among gardeners and horticulturists.

The 'Goshiki' Osmanthus is favored for several reasons. Firstly, its flowers are not only visually appealing but also emit a strong, pleasant aroma that can fill a garden or home with a delightful scent. According to a study published in the Journal of Environmental Horticulture, the fragrance of Osmanthus flowers can significantly improve the quality of life by reducing stress and enhancing overall well-being.

Secondly, the 'Goshiki' Osmanthus is highly adaptable to various climates and soil conditions, making it a versatile choice for gardeners across different regions. This adaptability is supported by data from the United States Department of Agriculture (USDA), which indicates that the 'Goshiki' Osmanthus can thrive in USDA hardiness zones 5 through 9, covering a significant portion of the United States.

Furthermore, the 'Goshiki' Osmanthus is known for its disease resistance, which is crucial for maintaining a healthy and attractive garden. A study published in the Plant Disease journal highlights the 'Goshiki' Osmanthus's resistance to common diseases such as powdery mildew and leaf spot, making it a low-maintenance option for gardeners.

In conclusion, the 'Goshiki' Osmanthus is the best Osmanthus variety due to its striking appearance, fragrant flowers, adaptability, and disease resistance. These qualities make it a standout choice for gardeners looking to add a touch of beauty and fragrance to their landscapes.