Spectra S2 or 9 Plus Advanced?

Al

I'm looking at Spectra S2 hospital strength breast pump and Spectra 9 Plus Advanced portable one. With the first pregnancy I had Spectra S2 and was very happy with it. Now I'm looking at Spectra 9 Plus and thought maybe it's better than the S2, because it has inbuilt rechargable battery in it and it's smaller and lighter than S2.

If anyone had used both or just 9 plus, could you let me know your experiences.

I would greatly appreciate it.