 Rubius Therapeutics NASDAQ:RUBY and BioCardia OTCMKTS:BCDA are both small-cap medical companies, but which is the superior stock? We will compare the two companies based on the strength of their earnings, risk, institutional ownership, valuation, analyst recommendations, dividends and profitability. Earnings Valuation This table compares Rubius Therapeutics and BioCardias revenue, earnings per share and valuation. ... 