Mario Gabelli (Trades, Portfolio) explains why his two favorite energy stocks are National Fuel Gas and Weathorford International.
In the case of National Fuel Gabelli likes the company's huge exposure to the most economic shale gas play in the United States, the Marcellus.
Gabelli likes Weatherford because of its huge exposure to the horizontal drilling and multi-stage fracking boom.
He also offers a bonus pick.... Viacom.
