Hi! I'm afraid I have neither of those prams, although I did have a look/push of the twin aria in the babystore and it is incredibly light!! I also like how the seats actually look upright when they are in the 'upright' position - so many prams these days seem to have little ones in a leaning back, slumped position even when they are at their most upright position.
Good luck deciding - have you had a look at the reviews on prams and strollers dot com?