Hi J, welcome to the forum. There's a wealth of information on this board to help ressurect your credit.
I'd suggest first off by reading "Credit Scoring 101":
Your charge offs, and collections, if any will haunt you for 7 years, if not taken care of. And it is certainly a major contributor to keeping your score in the cellar for the duration.
I consider both to be what I call "fatal baddies". Very difficult to get higher scores with them.
I'd suggest you offer to PFD(pay for delete). It has worked to remove collections and charge offs countless times. It's worked for me as well.
And regarding the question of whether to pay a collection and/or charge off, ask yourself, what is the right thing to do? That is something only you can answer.
Good luck to you