Ramped front sights are an older thing now; seen in revolvers and pistols prior to the combat sights like the Novak designs which incorporate the best compromises between the ramp and the target or competition sights.
The ramp sights give off glare and are not precisely focused when aiming. That's why they serrate them. The steps in the serration casts small shadows on the sight which make it look darker and, hence, clearer when aiming. The other way to improve the sight picture are the red inserts put into the ramp as seen on older S&Ws.
The undercut target sights cast their own shadow which make them clearer for aiming. The sights appear blacker than a ramped one.
The good thing about the ramp sights is that they give a snag free draw from a leather holster. The competition sights are taller, with the undercut, which can snag from a leather holster during a quick draw.
With the advent of Kydex holsters with sight channels as well as the low profile combat sights like the Novak, the draw issue is largely eliminated as well as the need for ramped sights.
So most sights now on modern guns are more competition looking and less ramped. They are just not as aggressively undercut or tall as true target sights.
For steel or any form of quick shooting, my preference would be a thin FO target style front sight with blacked out rears. This will give the quickest flash sight picture IMO.
