Micro Needling and Stem Cell Serum or Rio Blush CO2 therapy for stretchmarks? (photos)

Which would be the better option? I don't want a tummy tuck. If I could get a little result out of some skin tightening, I could tighten the rest with exercise. Its loose skin, but when I pull on it, it doesn't feel extra loose. It still feels like its thick & when I press on my stomach, I can still feel muscle underneath. I just want a head start. Excuse my psoriasis, please and sorry about the picture quality. Not looking for a miracle, but at least something to make the marks less noticeable.