I would preffer the American one. Let us have a high court. A Chancellor with his cabinet as the executive power. And thenparliament as the legaslative one.
Allthough that we only vote for the Parliament, which the Chancellor have to have his support from. Like it is today.
So yeah, it would be like today minus the President.
Germany almost certainly has some kind of high court.
It does not appear wise to me to unite the offices of president and chancellor in one person. Let the symbolic power of the head of state be rendered neutral by entrusting it to a monarch without any real power of his own. A font of stability, if you will.