By chance I have both these prams - I got the P & T explorer as needed the doubles kit so it is good if planning on having more than one child close in age. However I love love love the MB urban elite and it is way better off road. the P & T seems quite tippy and unstable even when just pushing it on the grass to get to the playground where as the MB seems way more stronger and stable.
I personally prefer the MB but we do go off road so I guess it depend on your life style and future plans as to what will suit you!