Re: which pump is better?
I definitely recommend a Medela PIS advanced, even used. It cuts down on pumping time (especially at work since you might not be able to take longer breaks). It is a little pricey but it isn't far off from other electric dual pumps. A manual may not be able to keep up with the demands of pumping at work and maintaining your supply so I definitely recommend an electric.
Mama to Liam 9/07, Laine 5/09, Eliza 7/11, and Nora 3/14.