I use a sativa throughout the day to provide energy and focus. I am retired but have a rural property to maintain and animals to care for, so the extra energy is an essential effect.
My absolute favorite sativa is Durban Poison. It is a high in THCV which has several helpful properties such as appetite suppression and bone growth. The high it gives you is a clear headed energy with a gradual come down that never leaves you wasted.
Jack Herer or any Jack is another favorite. It offers high energy and motivation.
The Thai varieties are also wonderful. I find that they have a lighter happy high.
and a last shout out to Red Congolese/Congo. It's a wonderful nice light high with a burst of energy to help get things done.
I love my sativas.