When comparing Monsters & Magic vs Dungeon World, the Slant community recommends Dungeon World for most people. In the question“What are the best tabletop RPGs?” Dungeon World is ranked 4th while Monsters & Magic is ranked 42nd. The most important reason people chose Dungeon World is:
Unlike other RPGs where the GM creates the world and the storyline single-handedly, here GMs are specifically asked to leave blanks and players encouraged to fill them in.
Ranked in these QuestionsQuestion Ranking
Pros
Pro The Effect Engine
The game uses a single core mechanic, which is flexible enough to cover a wide variety of situations. This helps GMs immensely when characters want to do things that aren't already covered in the system.
The mechanic itself works thusly: all rolls are 3d6 + modifiers minus difficulty. The result is how many effect points the player can apply to the action -- or, if negative, how many consequence points their opponent can apply to a reaction. Dealing damage is one use of effect points, but there's a limit on how much can be dealt at once, so additional effects (e.g. distracting, disarming, unmounting, etc.) see constant play instead of only being used rarely or by super-specialists. This also means failure is interesting, since it results in consequences!
This mechanic is used to do everything, and the game essentially consists of nothing but examples of how to use it.
Pro Interesting combat
Attacks generate effect points, which you spend to do things to your opponent. However, the amount of damage you can do is limited, which forces players to do other things... and the effect system is broad enough that these can be things like cutting off a carrion crawler's tentacles, knocking an opponent's sword out of their hand, and so on. Failures on attack generate consequence points as well, which your opponent can use to do things to you.
Pro Mental defense and hit points
Characters have a "Mental Defense" score and "Mental Hit Points". These are used to help provide a unified system for handling social encounters and mental attacks via magic.
Pro Encourages players and the GM to build the world collaboratively
Unlike other RPGs where the GM creates the world and the storyline single-handedly, here GMs are specifically asked to leave blanks and players encouraged to fill them in.
Pro Great advice and systems to help GMs along
Dungeon World provides GMs with great advice on how to run a good session.
Additionally, GMs can set conditions that, if fulfilled, will give a player XP. It gives the GM a way of enticing players to perform certain actions they might not otherwise have considered or wanted to perform.
Pro Encourages creating relationships between characters
Relationships between characters are established during the character creation process as well as at the end of each session via Bonds. Bonds are simple statements that explain how a character relates to another character. An example of a bond would be, "Avon proved himself a coward in the dungeons of Xax’takar. He is a dangerous liability to the party and must be watched." Multiple bonds can be established at a time. At the end of each session bonds resolved and new ones created give XP.
Pro Narrative driven fantasy RPG
Dungeon World is set in a D&D-esque world with a distinct slant towards combat and treasure gathering while emphasizing narrative over combat mechanics.
The game includes classic fantasy RPG classes such as Bard, Cleric, Druid, Fighter, Paladin, Ranger, Thief and Wizard and D&D style ability scores such as Strength, Dexterity, Constitution, Intelligence, Wisdom and Charisma.
Pro Has a self-regulating power balance system
In Dungeon World, XP is given for failures, and automatically for any rolls that are 6 or below. It provides many benefits and chief among them is the fact that it allows players to catch up to the difficulty of challenges faced. Additionally, it encourages the group to attempt harder challenges, reduces grief caused by failure and clears the GM from having to track each individual player's level.
Pro Encourages playing according to character's way of thinking and morality
XP is given at the end of the session if a character is acting according to alignment. Alignments are categorized as Good, Lawful, Neutral, Chaotic, and Evil.
Pro Does not require special dice
The game can be played with common six-sided dice.
Cons
Con Not currently available in print
Is only available in PDF.
Con Few monsters & spells provided
The included rules have only about 20 monsters and 1st and 2nd-level spells. Third party publishers have supplements that provide more, or you can use ones from old D&D.
Con Hard for the GM with non-collaborative players
Con Combat system can be confusing for some
Dungeon World's combat system is not divided into turns in order to make it more fluid. But it can get confusing as to what happens in what order. It is purposefully frantic, but that can turn off some. Especially people with preconceived notions of how RPGs should be played.
In the most basic form - GMs narrate the beginning of an NPC's action to which the player responds. If the player's response triggers a move, roll the dice. GM narrates the conclusion.
Con It's not entirely free
The text is CC-BY but the game as a whole (graphics etc) is not free. You can make and sell your own games based off it but you won't find the PDF download for free anywhere.