Man, thats a toughy, but i almost want to say that skinny people with speedy gonzales metabolisms 
I'll do a comparision.
Fat People
I've had a relatively easy time losing weight. 3.3lbs a week on average, 60lbs total, and i've been trying for 18 weeks.
Skinny people
My best friend is 6'3" 156lbs. He works out 4 times a week. Works on builking at the like, yadda yadda, and it took him around 6 or 7 months to gain right around 15lbs.
But these are just my opinions from personal experience

I'll do a comparision.
Fat People
I've had a relatively easy time losing weight. 3.3lbs a week on average, 60lbs total, and i've been trying for 18 weeks.
Skinny people
My best friend is 6'3" 156lbs. He works out 4 times a week. Works on builking at the like, yadda yadda, and it took him around 6 or 7 months to gain right around 15lbs.
But these are just my opinions from personal experience
