There is no much difference between these two and Google is considering it one and same, but genuinely speaking both are different. Article Submissions is the thing which you write some content of your product, service or etc but where in press submission is one which you do when you launch a new service or product it is like Announcement type that you had launched so and so product.
What is press submission? plz tell me?????????????????????
The Press Submission is basically the EVENT that is to be happen in future or happened, IT IS NEWS. It is related to the date, Address.
While Article Submission is the Content rich Words that helps to provide general information about any thing.
Even Working at TECHNOCRAB weekly I write PRESS RELEASE AS I love the news that are real and latest.