I'm a fan of both drivers (and Alonso). Rosberg is a very good driver IMHO, but Hamilton has just that little bit extra, and is cooler under pressure, which is what makes all the difference.
Providing there are no more Mercedes mechanical glitches, and cowboy drivers (Maldonado please note) don't litter the track, then Hamilton will undoubtedly get the Championship this year.
P.S. Grosjean was pretty gross towards the end of the race, leaving the track corner after corner.