Warren Buffett’s Berkshire Hathaway Inc. has its hands in businesses ranging from Dairy Queen to Fruit of the Loom . Eli Lilly & Co. have the two jockeying for a spot in that top echelon . The Omaha-based conglomerate has slowly but steadily marched upward to command a market valuation of nearly $900 billion . In contrast, the world’s largest drugmaker has momentum on its side .