Getting down to the transits the lifts is always faster. From the transit to UK Border it is still generally, but not always, quicker, provided you don't get everyone trying to pile into the same lift. The lift doors used to be constantly re-opened by stragglers pressing the lift summons button, but that has now been fixed. If you run off the transit and get the doors closed quickly then it's a bit anti social but you'll be first to the Border.