Historically a lot of track bikes had very road like geometry, with longish headtubes. So to get riders down low enough, 'track' stems had more drop on them (like -10deg) or more.

Today a lot of track bikes are built with really short headtubes (so people can pursuit on them as well), and accordingly you don't need the stem to make the drop work. In fact a lot of bikes, like pretty much every BT will use a stem flipped up.

Past that stems are stems and just like any other bike component you pay for weight, stiffness, material and the name on it. Is that 100g ultraliteweight carbon stem any better than a 200g Thomson that will last forever? Depends how much that 100g means to you. Same with the brand really.

But in terms of your question is there any magical engineering in there? Not really.