The best strain of sativa largely depends on what effect you want to achieve. The best sativa strain for energy are sour desiel,jack herer, green crack. Best strain for creativity includes Chocolope,Super sliver haze,Dubian poison. Strains for creativity are Strawberry cough,Harlequin GDP and Super lemon haze. while the best strain for focus consist of Red congolese.Sour bread and Lucid blue