Hi Royfan,
you are right that if the journal is peer reviewed, it would be considered to have more academic weight. As such, if you have published a lot, it may be best to go for quality peer reviewed journals.
However, if you have not published yet, this may be good opportunity to get something published. If a professor asks you for your work, I would not ignore that. Also, it may be a good exercise to write your work in the format of a paper, and to go through the submission process. This may then help you to get later work published, in perhaps better quality journals.