The 380 is a short little case and a low pressure cartridge. The bullet can only be seated to a certain depth in the cartridge before the diminished internal case volume starts to raise the pressure above SAAMI spec. Obviously the bullet can also only protrude so from the case before the OAL starts to cause function and feeding issues.
So there are very narrow limits on the external dimensions of the bullet, and when you compare two bullets of the same DIMENSIONS one solid and one hollow point, the hollow point will be lighter. The bullets for 380 loadings are already limited to pretty low weight by the dimension constraints, and you further reduce the weight by creating a big hollow cavity in them - a cavity that is unlikely to create much expansion at the velocities the 380 is capable of achieving. Most 380 HP ammo has a bullet in the 88gr-95gr weight range. The upper weight limit for the 380 is somewhere in the 115gr range. IMO it is best not to give up any of that already limited bullet weight for a hollow point which is likely not going to give you reliable expansion anyway.
One of the issues with the low pressure 380 round is that if you keep the powder charge low enough to not exceed the pressure specs, the velocity is not only too low to create reliable expansion it is also so low that it limits penetration as well. In order to maximize penetration you want the heaviest bullet you can get. That means not giving up any weight for a useless hollow cavity in the front of the bullet.
On top of that, in the event that they DO actually expand, that will further limit their penetration. The more a bullet expands the less it penetrates. That's simple physics. Since penetration with the lightweight 380 projectiles is already only marginal, giving up any of it through reduced weight and/or expansion is a lose-lose proposition.
So all those things considered, I'll take the heaviest, solid, flat-point I can get for 380 acp loads. Ideally a bullet weight somewhere above 100gr. Hopefully that sufficiently clarifies what I was trying to say.