Omniscient is where the narrator writes as a nonparticipant (one not appearing as a character), and views the characters by seeing into the minds of all or at least some of the characters. He writes using "he," "she," or "they." He is all-knowing, or omniscient.
|Of course, this isn't him.|
I find writing in first person very interesting, as well, but...I believe the possibilities are more open for the third person omniscient writer.
There is also limited omniscient or even selective omniscient. As a writer, you can choose the character you would like to see through, whether it be a single character, or a major or minor character instead of seeing through all the characters.
The choice is yours. I've heard some people tell me that when they open a book to find out if they would be interested in reading it, they see how it is written. If it is in first person, they close it and go no further. I've heard this opinion from more than one person.
Thus, I've made my choice to write third person omniscient. Before you choose to do any writing, especially for a novel, find what suits you best. Of course, the choice is yours.