Medela vs spectra s2?! (&why)

Narrowed down to the two pumps Ive been leaning towards. With my first I used natures bond and hated it because it wasnt a strong enough suction and I ended up producing less and less milk because of it and eventually switched to formula. This time around I want what feels most like hospital grade. I dont care about loudness or things of that nature I just want a strong suction and Ive heard mixed reviews about both. Help.