i m a medela mini electric n mini electric plus user myself so can only give you one sided opinion..both pumps r very noisy..
Medelas parts r easy to assemble..disassemle n clean... Believe avent also have same function..
If i am pregnant with second one i will get medela freestyle...cos its quite quiet.. Handsfree n you can lie down on bed to express milk... I think...
It all depends on your budget actually