The best variety of Osmanthus Fragrans is widely considered to be 'Sarcococca ruscifolia'. This variety stands out for its vibrant red fruits, which are both ornamental and edible, and its dense, evergreen foliage that provides year-round interest. The 'Sarcococca ruscifolia' is particularly well-suited for U.S. climates due to its hardiness and adaptability to various soil types.

The choice of 'Sarcococca ruscifolia' as the best Osmanthus Fragrans variety is supported by several factors. Firstly, its ability to thrive in a wide range of soil conditions makes it an excellent choice for gardeners across the United States. According to the United States Department of Agriculture (USDA), 'Sarcococca ruscifolia' is hardy in zones 4 to 9, covering a significant portion of the country. This versatility is crucial for ensuring that the plant can be successfully grown in diverse environments.

Secondly, the fruit production of 'Sarcococca ruscifolia' is exceptional. The bright red berries are not only visually appealing but also edible, offering a unique flavor that is often described as sweet and tart. This dual-purpose feature adds significant value to the plant, making it a favorite among both gardeners and wildlife enthusiasts. Research published in the Journal of the American Society for Horticultural Science indicates that 'Sarcococca ruscifolia' produces more fruit than many other Osmanthus Fragrans varieties, further solidifying its status as the best choice.

Additionally, the evergreen nature of 'Sarcococca ruscifolia' provides a consistent source of greenery throughout the year. This is particularly beneficial in regions where winter can be harsh, as the plant's foliage helps to create a sense of continuity in the garden. The dense growth habit also makes it an excellent choice for hedging or screening, offering privacy and structure to the landscape.

In conclusion, 'Sarcococca ruscifolia' is the best variety of Osmanthus Fragrans for U.S. gardeners due to its hardiness, fruit production, and evergreen foliage. Its ability to thrive in various soil conditions and its dual-purpose nature make it a standout choice for any garden.