Also thanks for the reports - this is one of the strong side of this forum.
I also know both hiltons in munich - and can underline all of this report.
By myself i prefer the aprk atmosphere - especially when i get a park view room.
But every vistor, not depending in which of both you stay, will ahve great stay in munich and in the hilton. For me both belong munich hiltons belong to best hilton hotels in the world.
So enjoy your stay in munich if you plan one