 I-Mab NASDAQ:BDTX and Spark Therapeutics NASDAQ:ONCE are both medical companies, but which is the superior business? We will compare the two businesses based on the strength of their analyst recommendations, dividends, valuation, risk, earnings, profitability and institutional ownership. Insider and Institutional Ownership 0.0 of I-Mab shares are owned by institutional investors. Comparatively, 88.4 of Spark ... 