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That depends a lot on your temperament and goals. Residential is better if you like simpler, smaller, easier, more fun. Commercial is better if you like complicated, bigger deals. Commercial typically has more potential for bigger income opportunities, but investing in residential properties can provide good cashflow, as well. I have only ever invested in residential because it's easier for me to grasp, and I do pretty well.
Real Estate can be very lucrative if you're at the top of your game. Commercial real estate, in an active location, with a top firm, might be an entrt level job, if they have an intern program. You are best off focusing on your education, possibly an MBA, then going to a Wall Street firm that specializes in large real estate transactions. Wall Street firms go after smart real estate associates with advanced degrees and who interview with gusto. But coming out of school, at a young age, I would not recommend real estate selling or leasing. I would suggest facility management, real estatec operations, and real estate financing.