Report or Template?. I don't know what to choose

Report or Template?. I don't know what to choose

Hello all
I've entered some data about the accounts, I've created a new module, called Gestion, linked to the account.
It's working very well to enter data, seems it will be useful, but I would like to print this information.

It's a very simple report, and it will be used only for internal purposes. It will be printed for each account when needed.
I want a header with some of the fields of the account (name, area, type, language, country, prices conditions, ...) and after that I want to add the data of that module (Gestion), as a list with the most important fields. One of those fields is a multi-line field.

So, what I would like to ask is:
- Does I have to use a report or I have to create a template?
- Does I have to use automatic field width or may I set the width for that text field?

In addition this report is very similar to the print preview shown in the account screen, but I don't need so much fields for the header, and I want only to see the Gestion module data, and if possible, with less fields or a better adjustment for the width.

Thanks in advance for your answers