Pressbase offers Free Trial, but PR Underground does not.
PR Underground is designed for Medium Business and Small Business.
Pressbase is designed for Individuals, Medium Business and Small Business.
Pricing for PR Underground Starts at $49.99per Release whereas for Pressbase Starts at $39/Month when Billed Yearly.
Some top alternatives to PR Underground includes PressRush, Agility PR Solutions, Newswire, Meltwater, Mynewsdesk, Presshub, PressKitHero, PressValue and Pressbase.
Some top alternatives to Pressbase includes Mynewsdesk, Posted, Superdesk, Speedy Newsletter, Qualified, Workvivo, Blog To Social, Slog, Datanews, Nano, SharpDash and IFTTT.