When comparing The Pool vs Dungeons & Dragons v3.5 / Pathfinder RPG, the Slant community recommends Dungeons & Dragons v3.5 / Pathfinder RPG for most people. In the question“What are the best tabletop RPGs?” Dungeons & Dragons v3.5 / Pathfinder RPG is ranked 29th while The Pool is ranked 34th. The most important reason people chose Dungeons & Dragons v3.5 / Pathfinder RPG is:
The D&D v3.x family was published under an Open Game License which encouraged third-party material. Two editions later, there is still a thriving market creating new 3.5-compatible resources.
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Pros
Pro Rolls are made to resolve intent not actions
Instead of rolling to perform actions such as swinging a sword, rolling is used for resolving intent with descriptions of actions left to players and GM to describe.
Pro Enormous pool of source material
The D&D v3.x family was published under an Open Game License which encouraged third-party material. Two editions later, there is still a thriving market creating new 3.5-compatible resources.
Pro Actively supported via Pathfinder RPG
When Wizards of the Coast discontinued D&D v3.5 development in favor of 4th Edition, Paizo took advantage of the Open Gaming License to publish an updated revision of the 3.x rules under the title Pathfinder RPG, which is still their flagship product. Notably, Pathfinder RPG has consistently outsold 4th Edition.
Pro Modular system encourages creativity
The D&D v3.x family 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.
Pro Many easy to comprehend books and other resources
Pro Perfect balance of DM storytelling and deeply granular rules.
All of the deep-dive rulebooks provide the option for endless complexity - go as far as you want, and you'll never run out of opportunities. However, the basic mechanic of "roll a d20 and add your bonus" is simple enough that the DM can tell stories, create worlds, and build adventures with their party.
3.5e is the perfect edition.
Cons
Con Monologue of Victory may stop any GMs plans
The Pool includes a system, called the Monologue of Victory, that allows a player to take over narration of the game in the event of a successful roll without the GM being able to interfere. As such using the system for complex plots may be difficult, because the player may remove an essential part of the story without knowing it.
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 Casters are significantly more powerful than non-casters
Con Detailed 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.