Well, I started there and got here from a thread there. I do favor the site but because of the digital art aspect not retouching. I must say the group is the absolute best at sharing and helping with effects, it is rare that someone posts something that is not fully explained in detail and the willingness to walk you through it if you still can't get it. You rarely is ever hear "I forgot" "to hard to keep track of" "lost my notes" or the abscence of response with regard to direction, I think that is it's most stellar draw, they are always there to help and support your efforts.
But, there is no comparison to this site when it comes to restoration work and help And certainly nothing to compare to the challenges.
Both have their accolades and I for one could not do without either.