I had a dual major for my undergrad and enjoyed it. I took a lot of very hard classes on both sides of campus.
Unless you have a full ride, I would look at your finances as well. State and smaller schools will leave you nearly debt free which will allow you greater freedom to pick and choose jobs when you graduate.
If you have the freedom to work for startup or as an intern rather than take whatever comes along, your long term career will benefit more from this initial experience rather than where you went. And you will have more fun.
For this reason, I passed on the Ivy League offers as well as another private school and went to a state school with a lower cost of living.
