I would say the A320 based on how many airlines in the uk that operate them.
i had a bizarre dream that i saw an A321 take off and get taken over by the computer and flew out of control taking people on a rollercoaster ride which scared the beejezzers out of me, i know boeing are making FBW now but i just get worried about the computer taking the controls like what happened with an Emirates 777 a while back. I love Airbus and boeing equally btw.