I'd never use Green Stuff, heard a lot of bad stories about them. A friend had them on his car which i took for a drive, they didnt feel any better than stock, and seemed to require more pressure than a "performance pad" should. Other issues include a lot of brake dust, dont last long and fade badly if abused to too long. Ive also read that they're supposed to have improved the materials so not sure exactly what they've done to improve.
Ive got some redstuff on my car at the moment and rate them highly, i was very sceptical with ebc stuff in general, but they have really impressed me. They feel progressive and reassuring. Ive never got them close to fading and dont think i could get them too even on a track day. They seem to bite very very well from cold (usually taking me by suprise) and then to get the best out of them, you need to get the temp up. Only disadvantage ive read is that they tend to eat disks. Ive seen no evidence of that yet so far and dust wise, they are far from the worst ive had. Mintex were extremely dusty!