I also think finance offers more diverse opportunities. However, if your friend likes accounting and does well, 3.2 or above, s/he can probably get a good job that pays well. Some big regional firms also provide good opportunities.
For investment banking, the school you attended seems to be more important than your major. This is even for entry level. Although, to move up in certain areas, a top school MBA certainly is required.
One of D1’s closest friends ( she is actually traveling with her in Asia right now. I think they arrived in Cambodia from Hong Kong today) graduated from Cornell into investment banking. She went from IB into something else (asset mgmt. or hedge fund??) She will be starting her MBA at Harvard this fall. She will have her pick of jobs I am sure. Plus she is fluent in Chinese as well as English.
D1, on the other hand, as a trader does not need an MBA to move up. Just success in her job.