I finally read the comics up until the point we're at now in the TV show. Some things are a little more clear, not much was spoiled for the future, and I'm contemplating reading further. Some things are different completely, some things are the same, and some things are the same, but portrayed in a different time frame or with some slight tweaks.
I think the show is much better than the comics thus far. I'm sure the comics have developed a huge extent more since this point of the story, but I think the TV show is leaps and bounds better in the sense of drama. Granted, I skimmed the comics very quickly.
If anyone is wondering, I read through #13 in the comics. #13 spoiled a little of what will most likely be the beginning of next season, so you probably want to stop at #12 if you do the same. Then again, stuff that went on in #13 in the comics may not happen at all. There are some different characters involved who may or may not be developed in the television series, so don't blame me if you read that far, they are introduced, and you are spoiled in their role.
The link to PDF files is below: