Best pump for a working momma

I am looking for some recommendations on a good Breast pump for a working momma. I breastfed both kids and pumped at work using a Medela Freestyle which was wonderful. I will be home for the first 5 to 6 months but going back full time being away from 5am to 5PM I need a pump that won’t need a plug. I’ve heard lots of great things about the Spectra S1 and scared to make the switch.