PDF fixed vs automatic column width

I have a document (a report) with a table structure. It can be exported to PDF. I want to ask, what is better from the UX point of view?

a) Fixed column widths. Pros: all documents have the same visual structure. Cons: non-efficient usage of space, some cells become multi-line, longer PDF document

b) Adaptive column widths based on length of text in each column. Pros: each document separately looks better, more efficient usage of space. Cons: documents of the same type have different widths of columns. If I print PDFs with March and April reports to paper and put them side by side, their structure might be slightly different.

Thanks!