Most Profitable (Least Efficient?) Trading Markets

I'm an econ student looking to go into trading but I am wondering which markets are least efficient? It seems like the most inefficient markets have the highest return potential, especially since it seems like a trader's economic function is to make markets more efficient by taking advantage of mispricings and what not.

So of these markets, what is your opinion about the profit potential of each market? Do you participate in multiple markets?

Equity Market
Derivatives Market
FX Market
Commodities Market
Fixed Income Market
Real Estate/Alternative Assets

Thanks!