Spectra s2 or medela pump in style advanced

I'm still trying to decide between the two. Mommyxpress just called me and I'm able to get my pump now but I want to be sure! I'm leaning towards spectra simply because I had a medala last time and it didn't really do much for me. I couldn't even get an ounce with it. My mom recently switched from medela to spectra (after I told her all the awesome things I read about it.) And she said she gets way more than she ever did with medela. I only want the medela because I like their storage bottles and replacement parts are easier to find but I can buy the adaptor piece off amazon and use medela parts.

I just don't wanna make the wrong choice!