I've grown out Sweet Deep GF, Dynamite, FMS GF, and FMS Iced GF. FMS GF was arguably the most potent, but a PITA to grow. Very strong smell. I ran it for a few cycles. Dynamite is fairly easy to grow, self-supportive, relatively short and squat. Some variation among individuals, but not as much as the FMS strains. Iced GF can be killer. It's one of my bread and butter stains. It's not terribly stable, so finding the right individual is a must. I run a GF-dominant plant that yields extremely well, produces rock-hard colas, and smells a lot like grapefruit.
Simon