 Aridis Pharmaceuticals NASDAQ:ARDS and Amarin NASDAQ:AMRN are both medical companies, but which is the superior business? We will compare the two companies based on the strength of their dividends, risk, analyst recommendations, earnings, valuation, profitability and institutional ownership. Volatility and Risk Aridis Pharmaceuticals has a beta of -0.3, suggesting that its share price is 130 ... 