The answer to your question really depends on if you are looking for a surgical or non-invasive option. CoolSculpting is the only non-invasive body contouring device that you have listed in your options. Sono Bello and Body Jet Liposuction are surgical, but would work if you are interested in the surgical downtime or have a lot of fat to reduce. All of these options are permanent, in that the fat does not return to the treated areas. I would say that CoolSculpting is the safest of all the options you mentioned.
All of these treatments will yield long lasting and permanent results. However, CoolSculpting is the one which is the safest, most comfortable and is completely non-invasive. This is why CoolSculpting is so incredibly popular. There is little to no downtime, and results are natural looking. We have treated over ten thousand patients with CoolSculpting and I can honestly say that it changes lives. Good luck with everything!