Which breastpump do you prefer??

My insurance offers several for me to choose from, mainly I'm looking at the 'Ameda Purely Yours Ultra,' 'Medela Pump in Style Advanced,' and the 'Lansinoh Signature Pro.' Do any one have any experience with these or prefer one over the other?? I plan to try an exclusively breastfeed, and would like to pump and bottle feed when I have to return to work or for when I need to be away from baby.