Some folks say that plant physiology differs between day and night and both are important. Others swear by 24/7 light for vegging. Higher electricity bills and heat are other considerations. Either way, if there's been a definitive study proving one or the other approach is "right" I haven't seen it. Which is not to say it isn't out there....
20/4 is what I learned many years ago and stuck with, because it made sense and worked. The most important things are to shock the plant out of flowering mode and to keep cycle time consistent while doing so. If 24/7 is working for you, nuff said!