This depends on the thickness of your corneas, because the higher your prescription the more corneal tissue the laser will have to shape during LASIK in order to correct your vision.
LASIK sugery is safer than ICL and highly effective for refractions as high as -15.00 as well as being able to treat astigmatism much more effectively then ICL. The only caveat is that your cornea must be thick enough. For a -9.00 refraction, corneas in the 550 µm range or thicker are ideal. If your corneas are too thin, then and only then is ICL a great alternative.