1. A is completely / totally / entirely different from B.

　　2. A and B are different in some/every way / respect / aspect.

　　3. A and B differ in…

　　4. A differs from B in…

　　5. The difference between A and B is/lies in/exists in…

　　6. Compared with/In contrast to/Unlike A, B…

　　7. A…, on the other hand,/in contrast,/while/whereas B…

　　8. While it is generally believed that A …, I believe B…

　　9. Despite their similarities, A and B are also different.

　　10. Both A and B … However, A…; on the other hand, B…

　　11. The most striking difference is that A…, while B…