Hunting sights need to be fast and rugged. They should be visible and easy to put on target. The front sight should be a globe with a relatively heavy post. The tang aperture should be big enough to see through quickly without having to look for it. The rear can be either the Lyman style with a barrel mechanism or a simple hunter style as sold by Shiloh, MVA or The Riflesmith.
Target shooting requires more sophisticated sights.
The shooter needs to be able to adjust for minute variations in windage and elevation. To understand what sights are appropriate for different kinds of shooting, an understanding of windage is necessary. A 10 mph wind at 90 degrees to the bullet path will move the bullet approximately one minute of angle at 100 yards. This is about an inch. At 200 yards, the bullet will be moved two minutes, or 4 inches.