I might be in the 3, but think or at least want to think I'm in an aggressive position.

As I've aged, now 62, I've gone from 5 or 4 to lower and lower positions since passing 52 yo and the years I only leisurely rode a bike to riding more and more and more. Back to what I rode when much younger teen and the days I was also riding at fast high efforts.

If your fit philosophy is for low power output riding, then likely you are going to want to sit more upright. If you ride at a higher output level, then I'd think you'd find as I have that more drop on the bars and balancing yourself over the bb, not the saddle, provides much more comfort.

On a road bike, I'd claim that position 5 shouldn't even be used. If you want that position, you will be searching for saddles and changing your stems to rises and lengths that make it no longer a road bike. A cruiser style bike will be a much better choice for that.