Which breastpump would you recommend? How do I choose the best breastpump?

I have the spectra s1 and s9 and the freemie as well as a cheapo china brand I bought from taobao for $10. I bought the spectras from LAZADA - parallel import with no warranty so they are much cheaper then the store bought versions. I use the spectra s1 at home, spectra s9 at work. Freemie yet to use. And the china pump lies in my car for emergency. The suction of the S1 is much better than the s9 - but it's super heavy and bulky. The s9 is really small, light and portable. So if you are a working mum with budget for only 1 pump, I would go for s9 (pic attached).