article and press releases are two different things. The purpose of both are different press releases are for announcements of company events, seminars or now product launch and Article for information purpose with some helpful resource . You can give your all company details in press release but not in article because it looks like a self promotional. Both are good but I am a big fan of articles submission a huge source of traffic and backlinks also.
I've to agree with some people here yeah i don't think there's anyone that's more better, you just have to test which one works well for you or why don't you use both ? but at the end of the day your content counts thus the most important thing is your unique content .