Merck & Co., Inc. (NYSE:MRK) is one of the best medical stocks to buy now. On September 26, Bernstein analyst Courtney Breen maintained a Hold rating on Merck & Co., Inc. (NYSE:MRK). Its Pharmaceutical segment offers vaccines and human health pharmaceutical products, typically therapeutic and preventive agents. While we acknowledge the potential of MRK as an investment, we believe certain AI stocks offer greater upside potential and carry less downside risk. READ NEXT: 30 Stocks That Should Double in 3 Years and 11 Hidden AI Stocks to Buy Right Now.