What is your favorite breast pump? Have you tried more than one? Why do you think it’s the best?

I will be going back to work after I have my baby and want to continue to breastfeed for at least the first year. I would appreciate any and all advice.

*EDIT*

Here are my choices free from insurance:

Medela Pump in Style Advanced

Ameda Purely Yours

Ameda Purely Yours Ultra Personal double electric

Freemie Deluxe

Hygeia Enjoye

Lansinoh Signature Pro

Lansinoh Smartpump

Spectra S2 Hospital Strength

Spectra 9 Plus Advanced Portable

Tomy Quiet Expressions Plus