Magazines and audience appeal

A trailer only has 2-3minutes to sell the movie. During that time, they have to chose some of the best visuals to display so that the audience can see what kind of content they'll be watching. People are more likely to be interested in the movie by actually seeing clips from it - not by watching a 3minute video of someone talk about it. A minute 3 clip wouldn't even show the full interview.
In addition, a poster also has to be eye-catching if people are going to look at it in a public place. It cant have too much information because people wont be able to read it (e.g. if they were driving and saw a billboard ad).
On the other hand, a magazine provides more detail about the film than a poster or trailer. By having double page spreads, there is room to print long interviews with the cast and write detailed information about the film. This allows the reader to understand it better and become more intrigued.
They can't show clips, but they can still print impressive images to convince the audience to watch the film.
It also appeals to people who prefer to read, instead of watching TV or going on the internet. The reader may find it more pleasurable to take their time reading the magazine, instead of watching a rushed trailer. Another advantage is that unlike a trailer or poster; they can read the magazine anywhere. They may also prefer the informal, friendly style of the interview. Fans of the actor/director would be interested in their thoughts of the film and what the creation process has been like for them. They can read more about the character depth, the actor's opinions on the role and what the director is trying to achieve.
Furthermore. the magazine's audience is more specific than that of a TV or radio ad. While it can be argued that more people would see a public movie poster or trailer; magazines are sold all over the country and are often passed on to friends and family. A movie advertised in a high end magazine would also seem high quality.
The image above is the double page spread from Empire magazine. It is advertising the movie; Clash of the Titans. On one page is a large picture/poster of the film and on the other page is an interview with the director. The benefits of this spread is that it has more persuasive text (e.g. 'epic, unashamed creature feature') than a poster, as well as a secondary image. Usually posters have main image and very little (if any) text.
The introductory paragraph informs that the director is the same person who directed 'Avatar' and that the plot is about Perseus taking down Mount Olympus. In just the first chunk of text, the magazine has included the same amount of information that would be used in a trailer. Because more text is allowed, the writers can use more persuasive language to convince the audience that the film is worth seeing.
A magazine may not have sound, but it compensates by including a useful caption below one of the images to describe what is happening in the scene.
The spread also uses a variety of font designs to catch the reader's eye and draw them to the persuasive techniques. For example, the words 'Gods and monsters' are in large gold letters, sprawled across both the pages. The positioning of them has more connotation than the unified credits of a trailer. The fact that the word 'God' is higher than 'Monster' shows that the Gods are more powerful and mighty in the hierarchy of power. It also symbolises that the Gods are from heaven and the monsters come from down in the underworld.
The articles start with a large letter, which draws the readers eye to the start of the sentence. It therefore convinces the reader to read on. The gold font highlights the important parts, compared to the black writing.
In conclusion, magazines provide the audience with more detail and extra information on the film. This makes the movie more memorable by familiarising the reader with it. They can be just as visually stunning as a poster - but with more pictures.