I actually posted in a comment by mistake but I love my Aylesbury drake. Absolutely adore him. He has so much personality. I had two brothers but lost one to a fox attack. They are not aggressive, they love to wander around the garden, they shout a lot and dont like being on their own. My boy needs a companion but i have to wait until Spring when its breeding time in the UK. Thats why he shouts when the chickens go to bed and he's on his own in the garden. They are massive ducks. They are pretty tame - follow me round quacking. My garden is becoming a mud bath but i expected that. I didnt realise how big he would get lol that's my fault though because i just asked for "ducks" at the pet shop 
You do need the space for them though they really are big. My drake gets on very well with the chickens he doesnt attack them.
You do need the space for them though they really are big. My drake gets on very well with the chickens he doesnt attack them.