Why would you choose the 135 GDHP over the 158 LSWCHP, if you would?
I don't, myself; I make and carry a version of the LSWCHP +p. But I can think of a couple of reasons one might prefer the Gold Dot.
1) Better terminal performance after penetrating barriers. From tests I've read about, the soft nose of the LSWCHP can get deformed when banging through hard things, whereas the bonded/jacketed Gold Dot has a reputation specifically for performing well through barriers.
2) Bullet creep in a superlight gun. In a 12 oz Airlite, for instance, and in the hands of a particular shooter, the recoil of the FBI load might cause the bullets to jump crimp and grow in OAL to the point that they actualy tie up the gun. The higher friction of the Gold Dot in the case prevents this.
(I shoot an airlite and do not have this problem, but I make and crimp my own LSWCHP's and have tested them thoroughly)
3) Leading. Gold Dots don't lead, the FBI load (typically) does. I don't mind cleaning it up, but some may.
Agreed on the POA/POI issue, still. Most every .38 does shoot the 158's better, IME--but some folks just like lighter bullets, I guess.
ps--bpisler adds another potential reason--reloading speed. Hadn't thought of that one.