Development trait also plays a pretty big part in that weekly training XP. I would draft the Quarterback that you think is going to be better for the way that you want to play then adjust the scheme so he fits it to develop him. For example I like my QB's to be more mobile, I don't necessarily want straight scramblers but I'll usually look for a Strong Arm or Field General QB with the best combine stats in the categories that determine athleticism. I also usually look for a QB with higher arm strength so I have a somewhat mobile QB with the arm to really sling the ball downfield.
As far as scheme fit, with how restrictive the schemes are this year in Madden as far as archetypes I usually pick the one that fits the most players that I want to develop. You can still actually run the scheme you want in game by going with the playbook that you like. For example in one CFM I'm trying to build an athletic man coverage based 4-3 defense. The problem is all of the 4-3 schemes have zone for the CB archetypes. I switched my scheme to the 3-4 scheme that fit the most players in my front 7 so I could also develop them at the same time, but I still run with a 4-3 playbook in game.