 Tetraphase Pharmaceuticals NASDAQ:TTPH and Stealth BioTherapeutics NASDAQ:MITO are both small-cap medical companies, but which is the better investment? We will contrast the two companies based on the strength of their analyst recommendations, institutional ownership, earnings, profitability, valuation, dividends and risk. Risk and Volatility Tetraphase Pharmaceuticals has a beta of 2.33, suggesting that its share price ... 