Yep, if someone has the time to make a YouTube vid with Martial and Rooney's touches in the game, you'll see Martial constantly getting his nose towards the goal and taking on a man while Rooney runs away from pressure if he even manages to stay in possession. It's night and day between the two in terms of attacking mentality. We need someone who has the pace and technique to bring the ball forward leading the line.
Based on his performances compared to the others in his position this season, it doesn't make sense not to play Martial up front. Similarly, it doesn't make sense not to play Rooney on the bench. He's earned some time on his arse now.