I actually think the Stormtalon is a pretty handsome model

I've built 4!
But anyhow. In the game, it's a lousy way to spend 200 points, so I can't imagine anyone caring how you model it one way or the other, advantage or not
When we play, we give the turret a full, 180 degree frontal arc, and a very steep vertical arc (60 degrees downwards, and a full 90 degrees up), to account for a chopper-like vehicle with turbines in the front and back being able to angle its tail higher to shoot at a sharper angle. It just feels more "realistic" because the stormraven feels more chopper than jet. And plus, without that, the vertical angle on he top turret is horrible, unless you attach the whole model onto the flyer stem at a harsh angle.