When comparing Dungeons & Dragons 5th Edition vs Risus, the Slant community recommends Risus for most people. In the question“What are the best tabletop RPGs?” Risus is ranked 12th while Dungeons & Dragons 5th Edition is ranked 16th. The most important reason people chose Risus is:
Risus has a very minimalist rule system that breaks down all actions to their core function. Risus comes with a super short, four page rulebook (available in many forms and formats) that's easy to read, includes examples and has a bit of humor thrown in to make the process or learning more enjoyable.
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Pros
Pro Minimal rules though somewhat clumsy
5th Edition strikes a balance in keeping the rules simple in some areas, confusing and poorly thought out in others, while limiting the creativity of players and any real choice.
Pro Free basic rules PDFs
Wizards of the Coast provides free PDFs containing the complete core mechanical rules of 5th Edition D&D (combat, exploration, spellcasting, etc.) and a selection of iconic character options, monsters, magic items, etc. drawn from the full game. Though short on variety, the basic rules are almost playable and accurate to the full game.
Of course far more is free in older editions as well as cheaper, 5e is by far the most expensive edition, and it is almost as bad as 4th edition.
Pro Slightly encourages character immersion
Few core aspects of 5th Edition exist solely to encourage thinking in-character, including mechanical rewards for good roleplay and detailed character backgrounds with lasting effects in the game.
Pro Bounded accuracy
Bounded Accuracy is a core design ideal of 5th Edition. In short, it means the numbers don't get too big; this lets weak challenges remain relevant for longer, and strong ones become survivable sooner. In practice, it also places more focus on a character's inherent stats and less their class or on magical equipment than has been the case in recent editions, which is a another major downside to 5e.
Pro OGL content
As with other editions of the game, much of the content is released under the Open Game License (OGL) allowing custom modification, extension and alteration of the game.
Pro Advantage rule
Rolls 2d20 chooses best. This dramatically makes all classes feel the same and moves away from distinct, interesting classes.
Pro Lacks granularity
Overuse of lazy balancing systems such as concentration spells and advantage mechanic.
This removes player choices, fun and creativity.
Pro A good mix of the best rules of the previous D&D editions without the worst things
Pro New, popular & growing
This is the most recent edition of the game and is the only one for which official content is being produced. Do not expect to see new official adventures or splatbooks published for any of the older editions of D&D.
Pro Can be taught in less than 10 minutes
Risus has a very minimalist rule system that breaks down all actions to their core function. Risus comes with a super short, four page rulebook (available in many forms and formats) that's easy to read, includes examples and has a bit of humor thrown in to make the process or learning more enjoyable.
Pro Very flexible rules
Risus is not confined to a selection of pre-defined character-classes, settings or abilities. Characters are described via clichés such as Witch Doctor, Gambler, Musician with a number of dice assigned to each cliché that are then used in challenges that relate to the appropriate cliché.
Pro A large following that provides a lot of content
A large amount of adventures, artwork, characters, clichés as well as optional rules can be found for Risus. An excellent resource for all aforementioned things as well as many others is Risusiverse, a fan-made website of all things Risus.
Cons
Con Lack of granularity
Due to the simplicity of the rules, responsibility lies with the GM to govern the game rather than hard and fast rules.
Con Lacks the soul of older versions
Con It's too combat-oriented
It's meant for fight-y campaigns. Way too simple too.
Con Bland classes and races compred to other versions of DnD
Overuse of concentration mechanic, no racial stat modifiers and hardly any differences at all between races and classes, compared to previous editions.
Con Only popular because most people playing it have not tried any other systems.
Only justification for the system is to let critical role bring more people into the hobby. Once players try Warhammer, Vampire or AD&D 2e, they will have no need to return to 5e.
Con Worse mechanics than other versions of DnD
Especially spells, races and classes are dumbed down with lazy attempts to balance them, blocking player creativity.
Con Too shallow
Easy to learn, but not much to the game overall. Limited character depth and customization.
Con Very unbalanced
Thieves and Rangers are pretty much useless.
Con Casters are more powerful than noncasters
Con Almost no published material for 5e
WoTC has been super lazy since 3,5 and even that had only a third of the material available that TSR published for AD&D 2e.
Is is sad that WoTC after 7 years has not supported 5e or other versions better.
This is a great reason to look into 2e or 3,5e systems instead of 5e.
Con Little guidance can be found for GMs and players
Some prior understanding of how an RPG is played and what is the role of the GM is required as the rules cover only the very core of the system.