It really varies. I've had dozens of different DMs in AL* and DMed for dozens, likely hundreds of different players over the years. It's a great way to see how other DMs do things and to hone DMing skills.
I still prefer home games, even if some of the best gaming experiences I've ever had were AL games during large scale play interactives. There's something about a convention hall room of people working towards the same goal that you just don't get elsewhere.
*and versions from previous editions including LFR, LG, LC