At this point in your life you should not be too concerned about this because what you study in college and what you study in law school is largely irrelevant to what kind of law jobs you will be able to secure after graduating from law school.
Law school ranking and your class rank matter the most to employers of both criminal and corporate lawyers. Similarly, top ranked law schools generally don't care about what your major was in college as much as they care about the reputation of your college, and your undergraduate grade point average and Law School Admission Test score.
Since neither your major in college nor the elective classes you take in law have a huge impact on your ability to get employed you don't have to make a decision about going to law school until your senior year in college and you don't have to make a decision about what kind of law you want to practice until you start applying for jobs in your third and final year of law school.
Beginning corporate law lawyers on average do work longer hours than most beginning criminal law lawyers. This is because if you work in criminal law you usually start in government/public jobs like a prosecutor or public defender's office where there is no motivation to generate profits based on charging clients by the hour. If you start off as a corporate law lawyer you will be in private practice where the opposite is true.
If you work at a big law firm you work a LOT more hours. I worked well over 3000 hours (over 60 hours a week) my first year at a big law firm, whereas my friend at the District Attorney's office on average left the office more often than not before 7pm.
However, criminal law government/public sector salary ceilings out much lower than private practice, so most criminal lawyers eventually move on to private practice where they have to broaden their practice to include civil litigation which can include what you might consider less exciting, and the work hours often increase once you go into private practice.
Similarly, there are private practice corporate law jobs that pay less than big law firm jobs that require less hours at work. My friend who started in the DA's office now spends more time in private practice as a criminal and civil law litigator, and I spend less time at the office since I moved to a smaller firm.
The last thing you should know is that being a lawyer generally does not pay any better than any other field, so if you think that being a lawyer is a good career because it pays well you should seriously consider another career.
Look for a plaintiff attorney that can sue for damages for fraud. There is a good attorney search engine, targetlaw that you can check out.