In terms of the smoke (although I actually vape), I am happy with both strains, though they are very different.
Here are the two strains side by side (Bengi Haze on the left, GDP on the right).
GDP: The flavor off this plant is a strong fruityness that finishes with the pucker of grape. The high builds slowly; when it first hits I want to sit down and I am non-functional. After five to ten minutes, energy returns though, and have a good happy energy that puts me back on my feet. It is evenly split between head and body, giving me a nice body and head relaxation. It is a stoopid high, so any work-like tasks take forever. My sampling of the strain is great for going for walks, or puttering around the house. It is also a good durration high, lasting 3 to 3.5 hours.
Bangi Haze: Definate qualities of a sativa in this one. Flavor is subtle; some citrus, finishing off with pungent skunk. Since it's light in the flavor category, I find it unremarkable. The high comes on quickly and is all in the head. A soaring feeling that is very functional, unless I want to take more than two drags off my Hotbox. This is the kind of weed that I can fool folks into thinking I'm not high if I want. The high is short, not lasting more than two hours, and lets me down softly, with little to no 'burn-out'. Great regular daytime smoke, imo.