When comparing Dungeons & Dragons 4th 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 4th Edition is ranked 61st. 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 Concise and consistent rules
Compared to prior editions, 4th Edition D&D has dramatically simplified rules. There are very few special cases to remember, and all character classes (Fighter, Wizard, etc.) share a common pattern in how they gain and use combat abilities.
Pro Excellent tactical combat system
As a grid-based combat game, 4th Edition offers well-balanced and tactically rich gameplay. In particular, it features numerous effects which force or prevent movement, often preventing simple "charge and attack" tactics.
Pro Focus on heroism and fun
4th Edition downplayed simulation, and instead embraced cinematic action. The players are assumed to be the main characters of a story which revolves around them, rather than merely one faction in a far larger world.
Pro Best balanced version of D&D
Other versions of D&D tend to use a "balance over time" system, where some character types are weaker to start with and stronger later on, and vice-versa for others. However, this works poorly if your game doesn't continue for a long time, or starts with PCs already at a higher level. 4th Edition is the first - and so far only - version of D&D to do a good job of making characters similarly powerful at all levels.
Pro Character death is uncommon
To encourage boldness, characters are far harder to kill than in any other edition. This also allows players to invest heavily in the story and personality of their characters without facing the potential buzzkill of loss.
Pro A unique D&D experience
Not weighed down by sacred cows, and arbitrary rules for the sake of nostalgia and identity.
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 Too much focus on combat, not enough on roleplay
Con Ovely complicated
Con Not enough customization
Multiclassing has been reduced to the point where it is rarely useful past the first feat & limited to one extra class.
Con Combat drags
Due to the scaling of player damage vs. monster hit points, even simple fights can take a long time to resolve, particularly at higher levels.
Con Suspension of disbelief is often difficult
Making it fun was such a priority in 4th Edition that it frequently trumped making sense. This manifests in ways ranging from "minions" who die in hordes at the lightest touch, to broken weapons simply repairing themselves.
Con Grid combat is required for best combat experience
Though most other editions of D&D assume miniatures are used for combat, they have all provided rules for playing without them, while 4th edition has not. It even goes as far as to measure distances and ability effects in terms of "squares.".
And while it's possible to play the game without a grid, 4th edition combat places so much emphasis on powers and abilities that move you and your opponents around the battlefield that keeping track of such movement is important enough where playing 4th Edition without minis or a similar system loses most of the interesting parts of the combat system.
Con Equipment is mandatory to be efficient
Con It's the easy mode of D&D
Everyone has spells and unlimited HP.
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.