Pfizer Inc’s vulnerability to cheaper generics and its weak roster of experimental medicines will be on display Tuesday when the company reports quarterly earnings, reviving interest in its pursuit of AstraZeneca Plc or other deals to fortify its pipeline. While many industry watchers expect Pfizer to re-engage with Britain’s AstraZeneca in coming months, some say the U.S. drugmaker should consider targets more focused on biotechnology, a strategy that has paid off for Merck & Co and Bristol-Myers Squibb Co.