Ameda dual is the best!! I can finish pumping in 10-15min. and it feels like baby's suckling. I also have Medela mini electric and Avent Manual. Mini is very noise and the suction not as comfy as Ameda. Ameda is pricey ($1720) and not so widely available, so I tried Medela first. Ended up spending double la. =b
Avent is good for a beginner as a manual pump is not as scary to a new mom. I wasn't successul with Mini at the beginning worrying about the powerful suction.