Tender cuts of higher-quality beef are great for steak stroganoff. I personally prefer to use flank steak as it's great for searing quickly, is more budget-friendly, and has wonderful flavor and texture. Other cuts of beef that can be used include ribeye, sirloin, skirt, and tenderloin. I don't recommend using tougher cuts of beef such as chuck roast since it really requires braising to break down the fat and connective tissue and make it taste good.