Usually in the dictionary form + ことが or のが, or I-adjective + ことが or のが、meaning is the same. ex) わたしは食べることが好きです。＝わたしは食べるのが好きです。 わたしは楽しいことが好きです。＝わたしは楽しいのが好きです。 If, however, you put the pronoun of person before ことが or のが, meaning is different. ex) わたしは彼のことが好きです。 I like of him. わたしは彼のが好きです。 I like of his. By the way, you have to put 'の' between the pronoun of something or somebody and 'ことが' when you use this grammer with the pronoun. Well, I tried to do the best in this comment but it is not enough I think.... Hope this is a nice comment for you...:)