You are a new startup, looking to break into a big market. To do so you should:
a) Focus on differentiating against and beating the biggest vendor in that market
b) Focus on differentiating against and beating the most successful tiny vendor in that market
c) Focus on creating a compelling value differentiation from all other vendors in the market and disrupt the economics of that market
Answer? It could be a mixture of "a" and "c," but I'd be hard-pressed to agree with any strategy built on "b." Unfortunately, EnterpriseDB continues to fixate on MySQL, a growing but still tiny gnat in the grand scheme of the database market, when it really should be focused on where the dollars are: Oracle.
EnterpriseDB used to do this, of course. That was once its big claim to fame: Drop-in compatibility with Oracle at a fraction of the cost. Now? Well, let's just say its "Great Debate" between itself and...no one from MySQL strikes me as a sham, and one that is guaranteed to get it roughly $0 in revenue.
Hint to aspiring open-source companies: Your competition isn't other open-source software. That's not where the dollars are (yet). Your competition is the inefficiencies and excessive pricing of the proprietary software world. That's where the "great debate" is.