I compared all the groundschool courses that are about from the many colleges. A few of the colleges use quite basic material and the presenation wasn't great. If your doing a full time residential course, then possibly it doesn't matter.
I personally was after colour rather than black and white, txt easy to read, rather than the style of reading a newspaper.
Atlantic Flight Training did have some good material, I believe with Jeppesen, but their course CD and books were rather new, so I decided to go somewhere that seems to have proved itself with other pilots (not saying anything is wrong with their material, just felt Bristol's had gained a reputation).
My final decision came down to either OAT or Bristol material.
Good luck with your decision making, I'm sure you'll make the right one for suits you best.
Cirrus.