Mountain Buggy Duet vs Out n About Nipper double

[HeyitsBB]

Can anyone help me make a choice? Needed for 3 yr, 22 month & newborn (obviously not all at the same time) but needs to accommodate all of them.

I have a cosatto to and fro and it's dreadful. I need something easy to put up and down and is easy to steer.

I loved my mountain buggy, but even a single was huge. So i ended up with something smaller as well (for shopping trips)