Buttocks augmentation/hip dips with Sculptra or Radiesse or a mix of two? Is it safe? Does it last? Is the price the same?

I have been looking into Sculptra treatment for my buttocks because I was left with indentations from silicone removal, the BBL did not really do much and I don’t want to put myself Through that again. I went for a few consults for Sculptra and they said they can’t do anything by the hips because it’s bony but they can do the back it will improve slightly Then I found a place that mixes Sculptra with Radiesse and another place that offered to fix it with just Radiesse. What to do?