Does it make easier to explain (to answer every student's questions and check every student's mistakes), or does it make easier to maintain discipline (to keep the class quiet and make sure everyone is really doing the exercises)?

Your disjunction isn't complete there: it could be something else, like how many questions are asked. We LWers are of course familiar with the testing effect, but not so familiar with Bloom's 2 Sigma problem. Alas, I cannot seem to find the reference now, but I recall reading that in tutoring, students are asked 2 or 3 orders of magnitude more questions than in ordinary classrooms.