We choose the Roots. Like many brides I looked through tons of photos and wedding TR's on this site that former brides have posted. During this time, I found that while I liked most of the pictures, all of the ones I loved were by the Roots and I loved every picture of theirs that I saw. Their style was exactly what I was looking for. They are amazingly talented and such wonderful people. We did an engagement session with them this past June and I loved the pictures, there is a link in my PJ if you want to take a look.
It's really such a personal thing though so the best advice is to look through pictures and see what you like. I do find in general you get what you pay for, but you need to want the things you are paying a premium for. Some brides want photos with little to no editing, obviously that will cost less since there is less time involved for the photographer to turn the pictures around. For these brides it would be silly to pay extra for advanced edits. Other brides, like me, want the pictures to be edited. The photographer to me is the professional, I don't want every single picture, I only want the good ones. I also like the polished look of edited pictures. I always edit my own pictures from trips, so I wouldn't be happy if I had a photographer that didn't do that.
The good thing is that with the photographers listed above, you know that most brides have been happy with their work and that they have not taken anyone's money and run or ruined anyone's wedding day. So it's really a matter of picking the style that suits you and your DF the best.
Good luck!