I have a Duncan Distorsion HB as neck pickup in my Hamer Chaparral Standard (by the way: it sounds much more better than the Slammer-PU which was originally installed) and a SH-4 JB pickup in my Fender Strat plus. The TB-6 / SH-6 and the SH-4 are both excellent pickups from my point of view. In the neck position these two pickups have an extraordinary distorsion sound and (a little bit surprising) a very good clean sound as well. The decision for the your choice should depend - of course - on personel taste and prefered music style: I would say, the SH-6 has more mids and is better for high-distorsion-sounds (Hard-Rock, Metal). The SH-4 is a little bit more versatile. Some people say that for a Strat a SH-4 is the best choise of all. I would agree to this. So if you don“t want to make Hard-Rock or Metal, I would recommend the SH-4 instead of a SH-6 for a Strat.