I can't speak for a 1G 1200, but my 2G 600 were HH front and GG rear.
I went with EBC HH pads all around and noticed a definite increase in initial bite vs the factory Suzuki pads, although overall stopping power is about the same. (the change to steel braided lines DID increase overall power, however).
After about 10,000 kms on the EBC's, I have not seen any increase in rotor wear, but I also have NOT specifically measured them either, but they sure look fine.