Hours aren't better in corp as well. The things that makes corp better compared to liti, is that you have much lesser timelines to comply with (but you still have to comply with your clients' deadlines) and there is no pressure to "win".

Many interns and trainees think going to Court and fighting out in a trial is glamorous but in reality, the amount of preparatory work it takes behind the scenes is insane and good luck if you want to collect fees from client if the judge rules against your client and order costs. This alone is enough to make many switch to corp from liti.