Breastfeeding : Breast Pump

My insurance is allowing me to choose my breast pump and im not sure which one to choose. Between "Ameda Purely Yours Ultra Double Electric Breast Pump" and Medela Pump In Style Advanced Starter Set, what have you heard and what do you prefer ? Those are free I figure why not get the free one but I also have the option of paying the difference for a Spectra S1 or S2 Double Electric or the Spectra 9 Plus Advanced Double Electric