Home Depot ( HD) CEO Bob Nardelli "is painted with too broad a brush," and his company would be in a lot worse shape if he didn't lead it, Jim Cramer said on CNBC's "Stop Trading!" segment Thursday. "Where would that company and that stock be if he hadn't come in there?" Cramer asked. Moreover, "that's one cheap stock," with 20% earnings growth and a price-to-earnings ratio of 12. "I would buy them and sell Lowe's ( LOW)," Cramer advised. Meanwhile, a "stealth rally" in biotech suggests the sector has become investors' preferred defensive play, Cramer argued. He mentioned Gilead ( GILD), Amgen ( AMGN), Biomarin ( BMRN), Celgene ( CELG) and Genentech ( DNA). "It's become the safer place to be than big pharma," Cramer said. "People say, 'I want a little defensive play, I'm going to do it in biotech, not big pharma." Cramer's one caveat on the space pertained to Cephalon ( CEPH), where an upcoming hearing on Sparlon could breed bad news.