Want a great way to pitch a publication? Read the publication. Read the columns. Read the contributed stories. Do they take case studies? If they don’t, then don’t pitch a case study. If they do product reviews, then pitch a product review.
If you find a particular journalist who covers your beat, read the back issues and get a sense for his / style, interests, bias, etc.
The more you do your homework upfront, the better your chances of being successfull at pitching.