Flexible, easy to use, preview feature, and share with your team to cooperation
The formatting tool is easy to use, and similar to the wyswyg editing.
Lots of options with pricing, from entry level very low price, to additional options, depending on you intended for the PR.
If you use Newswire often, you can get package deals that provides additional discount and benefit.
Separate from the ease of use and all that, Newswire provides good customer services, and quick to respond, and speedy support -- only used it once, as I messed up on one of the PR I was working on. Review collected by and hosted on G2.com.