X2. We used to use the Berg gland nut until I broke one and lost a flywheel. Scat is the only one that stays the same diameter from the threads all the way up to the hex portion. Most have a relief cut on the outside where the threads stop which happens to be about the same point the inside is cut to make room for he needle bearing. That's where they break. We won't use anything but the Scat for now on.I don't know the "best", but I've been on the same Scat gland nut for over a decade. I torque it to over 450 ft/lbs with no problems. Pushing a full weight bug deep 10's on a regular 8-dowel setup without issue. No wedgemate or anything.