Illustration VS Concept - Why do some companies want Sketches and others want paintings?

Tutorials/Templates/Brushes - https://gumroad.com/trentk
Trents Books on Kindle - https://www.amazon.com/shop/trentkaniuga
Twitter- http://twitter.com/trentkaniuga

Equipment I use- https://www.amazon.com/shop/trentkaniuga
Why do some companies want Sketches and others want paintings?
Things I've worked on:
Overwatch (PC, PS4)
League of Legends (PC)
Diablo 3 (PC,PS4)
Hearthstone (Mobile, PC)
Burning Crusade (PC)
Wrath of the Lich King (PC)
Final Fight Streetwise (PS2)
He Man (GBA)
Terminator 3 (GBA)
CannonBallers (Mobile)
CreeD
Twilight Monk
Ikeda
Nova Colony
Galaxy's Edge
SodaPopSoldier
Millenium Actress
Goblins and Gnomes

Видео Illustration VS Concept - Why do some companies want Sketches and others want paintings? канала Trent Kaniuga