Sales-wise the top writer is Donny Cates, his books are Marvel best selling books. Hickman and Ewing follows, one for the X-Men relaunch, the other for Immortal Hulk, but that’s more on the quality / hype side than sales, it sells well but still way less than Cates’ and Hickman’s books. Artists is hard, there are so many talented artists nowadays that’s impossible to single out one. It’s not like when there were 4-5 top artists and a lot of average ones. And styles now are very diverse compared to the past, so it doesn’t make sense to make a rank. I think this is thanks to Alonso, that created an environment where there is no mandatory house style like in DC but a lot of different styles and creative freedom.