Unless you define creativity purely by goals or assists. Comparing strikers by their g/a contributions you'll find out Bas Dost is a better striker than Firmino.
The truth is Martial is a technically and intellectually superior footballer to Rashford, who only has the physical edge over him. I would have added a mental edge too but these days I'm not even sure about that. Rashford's physicality often benefits himself more than the team. A bit like Vinicius before recent seasons. Meanwhile, everyone (including Rashford) plays better, when Martial plays well but you'll find the reverse is not true. Kinda like when Ronaldo was our most "creative" player but the rest of the team stunk whenever he played but played better when he was benched...
The reason most people are calling for Rashford and Bruno to be benched is because they are the 2 biggest proponents of me-ball in the team, which is fine as long as it comes off. Lately, it hasn't been coming off, and worse it's coming at the expense of team play and cohesion.