I think you can get there through both channels. I would decide based on what you want, as I personally don't like corporate flying. However, I have heard that if you want to get a job for a 121 carrier, doing a job that most resembles that job would probably be best. This of course would be a 121 regional that is flying in the colors of a major. You also generally fly more at a regional, although the upgrade time may take longer. Of course, these days the majors may not be hiring for awhile, so my best suggestion would be to go somewhere you wouldn't mind staying for a few years. Hope this helps you.