I'm not sure about Avent or Ardo, but I'm using Medela Freestyle and I swear by it!
-Handsfree; attachable to your nursing bra
-Lightweight; bring it everywhere i go
-Powerful; I never need to press to the highest pump strength and I can get a decent amount of milk thus making it not noisy at all
-Twin pumps makes the pumping fast and easy withing 15mins, excellent for bring to work
Check out their website for more informations Freestyle
I got it at mumsandbabes (authorised dealer), got it at their warehouse sale, its very much cheaper than kiddypalace/mothercare etc...
Hope it helps!