Maptool by a long shot. I play warhammer 40k rpg and it's quite a complex system. Maptool allowed me to build a fully customizable framework which greatly supports the game.
If you really want to make a deep dive in the vtt world then Maptool is the only software out there that can go the distance.
If you really want to make a deep dive in the vtt world then Maptool is the only software out there that can go the distance.