When comparing Old School Reference and Indexing Compilation (OSRIC) vs Pathfinder, the Slant community recommends Pathfinder for most people. In the question“What are the best tabletop RPGs?” Pathfinder is ranked 26th while Old School Reference and Indexing Compilation (OSRIC) is ranked 32nd. 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 AD&D 1E aligned to d20 SRD
OSRIC is based on the well-known 1st edition of Advanced Dungeons & Dragons, arguably the most popular RPG of all time. It doesn't stick to is slavishly, though, but instead brings in a few innovations from the later "d20 SRD" to regularize the system a bit and fill in some of the gaps. It is, however, still very much a 1980s system.
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 Complex and inconsistent rules
There is no "general system" for doing things in the game - everything is a special case. This can result in a lot of page-flipping to find the particular rules for something, and in problems for new GMs who don't yet know the system well, or who aren't comfortable with improvising.
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.