The Samisch used to be the Main Line against the KID. 5.Nf3 only overtook it in the last 20 years. It gives you as White some of the same plusses as the Makagonov in that it controls g4. It, like 5.h3, is also a possible precursor for a Kingside attack.
It's more flexible than the Makagonov in that you're not committed to action on either wing. You can develop your pieces in relative comfort before castling on either wing. 5.f3 also gives solid support to your center.
The only real gripe to be had against the Samisch is that it's a little slow. 5.f3 does not develop a piece. Worse again it takes f3 away from the Knight.
This piece must wait for the Bishop to leave home before he can take up residence on the humble e2 post. It is largely this factor that has seen the Samisch slip, albeit slightly, from the top of the list.