I would have to say 1.12? Why, well heres my take on things.
GSC:
GSC is scripting. It is a good challenge and it ends at your creativity. Though its getting old and its hell at debugging. You also have to bypass now, and need other bypasser's to help debug.
CFG:
CFG is NOT scripting and has zero logic. Its just commands to thew game engine. Though this creates a challenge on making fun and useful mods. You can also play with others and don't need host for most mods to work. It also gets you to a point of wanting to figure more of the game internals out so you can have more power in the game. Litterly everything is controlled by game commands and DVAR's, its not even funny. Its just sad how lazy IW really are!
It also gives the challenge of getting GSC mods back, which is VERY doubtful. Though other interesting things have been found

..
I like GSC, but I am just up for a challenge. I also am looking to the future, never the past.
So thats my explanation on why I prefer 1.12