RF microneedling or CO2 Fractional- which is more effective for older white stretch marks?

25 year old female - brown skin. I’ve too many stretch marks all over my body. I understand we can’t remove stretch marks especially old white ones but I’ll be happy with any kind of improvement. Currently I can only afford to do one procedure and I was wondering in your experience what do old stretch marks respond better to? CO2 fractional or RF microneedling? I’ve seen a few deems and some suggest MNRF while some say CO2 fractional is a better option.