PR will help with sales, but also improve conversion.
Marketing should (if done right) increase sales regardless of PR (if landing pages are done right).
I've successfully helped over 300 entrepreneurs, startups and businesses, and I would be happy to help you. After scheduling a call, please send me some background information so that I can prepare in advance - thus giving you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/assafben-david