As Rick A notes, it's personal preference. I and two other DMs I play with use fog of war exclusively. I played with dynamic lighting, but one of my players had a much older PC that couldn't support the GPU requirements (he'd see stuff appear after minutes of waiting, really old PC). The othe DM tried it, but the tendency of corners to display things not in line of sight of the player, if not constructed very carefully, and the ability of players to "stick their heads through the wall" and see things they shouldn't at times finally turned him off from it. It's nice when it works, but for manually created homebrew maps it adds a lot of extra work, for what I consider very little narrative/immersion benefit. And that extra work is the reason the third DM has avoided it (one of my reasons also). But others clearly like it. Not that fog of war is perfect. In using the new UI I recently managed to reveal half the map when it somehow got stuck in "show a rectangle" mode when I was done doing a reveal and trying to move my mouse back to the side menu to switch to another tool. Much hilarity from my players ensued.