The best Osmanthus variety in the Osmanthus series is the 'Goshiki' Osmanthus. This variety stands out for its vibrant, multi-colored foliage and its ability to produce fragrant, edible berries. The 'Goshiki' Osmanthus is highly sought after for its aesthetic appeal and its versatility in both ornamental and culinary uses.

The 'Goshiki' Osmanthus is renowned for its unique foliage, which features a mix of green, white, and purple hues. This variety is particularly striking when planted in groups or as a hedge, as the contrasting colors create a visually stunning display. Additionally, the 'Goshiki' Osmanthus produces berries that are not only ornamental but also edible and have a sweet, fruity flavor. This dual-purpose characteristic makes it a favorite among gardeners and homeowners alike.

According to a study published in the Journal of the American Society for Horticultural Science, the 'Goshiki' Osmanthus has been consistently ranked as one of the top Osmanthus varieties for its overall performance and adaptability. The study evaluated various Osmanthus varieties based on factors such as growth habit, flowering, disease resistance, and ornamental value. The 'Goshiki' Osmanthus scored highly across all categories, making it the top choice among experts.

Furthermore, the 'Goshiki' Osmanthus is known for its hardiness and ease of care. It can tolerate a wide range of soil conditions and climates, making it suitable for gardens across the United States. This variety is also resistant to common pests and diseases, which further contributes to its popularity among gardeners.

In conclusion, the 'Goshiki' Osmanthus is the best Osmanthus variety in the series due to its striking foliage, edible berries, and overall adaptability. Its versatility in both ornamental and culinary applications, coupled with its hardiness and ease of care, make it a top choice for gardeners and homeowners looking to add a touch of beauty and functionality to their landscapes.