Top fund manager Ken Heebner says that even after the big stock market rally, we’re still seeing a “historic buying opportunity”. But another investing guru, Bill Gross, is less optimistic.

Heebner tells CNBC that he thinks the economy is in the beginning of several years of expansion. Consumers are spending again, and he expects an “earnings explosion” that will make stock valuations look much more attractive. Gross, however, sees slower earnings growth and a world in which stocks return 5% to 6% per year.