i see people using the black hat all the time, and rarely do I see people using EMP grenades which surprises me. the only real advantage I see of the black hats, are being able to hack enemy equipment, and take down flyers. However, if it is anything above a uav/CUav, you need 2 black hats to destroy it, which could be done with one slot with a launcher.
Not to mention an emp grenade will take out all the equipment in a fairly large radius. Anyway, thats my 2 cents, opinions?