My personal preference is BA282 because I like getting in to LHR around lunchtime. Plus, while I don't sleep all that well on flights as a rule, the meal service is at more or less my normal dinner time and 9-10pm is my normal bedtime, so if I do happen to get a good nights sleep it feels sort of like sleeping late to wake up late in the morning (GMT).

My personal opinion is that BA 268 gets in too late in the afternoon for me to make onward connections which arrive at a reasonable hour.