Since LibreOffice 4.5ish I have preferred both writer and calc. Feels more robust and consistent + a lot snappier (incl. starttime).
I only use it for collaborative editing of docx and xlsx.
I only use it for collaborative editing of docx and xlsx.
Because I don't know about German specifically, but with some languages, Libre office is very buggy.
( star office -> open office -> libre office )