The drop leg holster is great when decked out in full gear - IOTV with plates, full compliment of mags/grenades, first aid kits, camelbak, assault bag, and everything else. Stays out of the way of everything. If I wasn't wearing all that stuff, I'd go with a hip holster.
As said before, should wear it as high and as tight as possible. easier to reach, and feels more secure when your running around.