It is indeed surprising classroom based ATPL theory training is rarely being written about online. I would personally choose classroom based for sure because I prefer face to face learning and the social aspect is an added benefit. CBT is cheaper but you are usually on your own except for some forums. I believe classroom based training is more efficient and faster than distance learning. Oxford has a 6 month program including exams and I doubt you can do faster with distance learning unless you like to be on your own in front of a computer for at least 7 hours a day.... And yes, first time passes are important for employers.