When comparing Heroes Against Darkness vs Pathfinder, the Slant community recommends Pathfinder for most people. In the question“What are the best tabletop RPGs?” Pathfinder is ranked 26th while Heroes Against Darkness is ranked 33rd. The most important reason people chose Pathfinder is:
The base world is detailed but still open and there are tons of options.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Focuses on simplicity
The game uses a single "d20 + modifier ≥ target" mechanic for everything. Characters can be created in less than 5 minutes. The writing is concise and clear.
Pro Deep, without being cluttered
A lot of meta-tools such as templates, etc, that make combat encounters incredibly simple to construct. Great tools for creature-building. A lot of good information on world-building. You can make any type of game efficiently, from hack-and-slash to role-playing. If you have played in a D&D campaign, this is a great choice for your first outing as a GM.
Pro Open gaming with lots of options
The base world is detailed but still open and there are tons of options.
Pro Compatible with D&D 3.x material
The D&D v3.x family was published under an Open Game License which encouraged third-party material and as a result provided an enormous pool of resources. And two D&D editions later, there is still a thriving market creating new 3.5-compatible resources.
Pro Modular system encourages creativity
The Dsystem is designed around building characters, monsters, magic items, etc., from small simple pieces. For each piece, any of countless others can be substituted, allowing near-infinite customization and variety.
Cons
Con Requries prior knowledge of RPGs to completely understand
Some knowledge will be required to understand the rules as there are some unexplained conventions that are presumed to be understood.
Con Encourages character optimization outside of play
With so many options available to the player, and the almost unlimited ability to combine them, certain "character builds" are patently superior to others. Players who spend a lot of personal time poring over the rules can often create characters so powerful that players who don't optimize feel useless in games with those who do.
Con Detailed combat simulation slows down gameplay
Due to countless situational modifiers, players and DM alike have to put a great deal of thought into decisions about position, order of actions, etc., to the point that six seconds (one combat round) of "in-game time" frequently takes half an hour or more of play time.