I want to know what are the decompression choices to relieve my sciatic nerve compression in buttocks?

Depends on the cause: This depends on the source of the nerve compression. Most are caused by disc herniations which are treated surgically with microdisectomy. Some are done with small open incisions and some percutaneous. It mainly depends on your insurance as to the procedures that are covered. If it is due to stenosis then a laminectomy or foraminotamy may be offered.