When comparing Microlite20 Purest Essence vs Risus, the Slant community recommends Risus for most people. In the question“What are the best tabletop RPGs?” Risus is ranked 12th while Microlite20 Purest Essence is ranked 54th. 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 Easy to start
If you are looking for a game like DnD, but much easier - try Microlite20 Pures Essence with Ultimate Fantasy supplement.
Pro Rules will be familiar to any veteran D&D player
As Microlite20 is a stripped down version of the d20 SRD with the same classes, races, items and abilities, it will be easy to understand by anyone that has previously played a D&D game. Especially D&D 3.x.
Pro Compatible with d20 SRD
Any material written for the d20 system can be used with the Microlite20 system. All creatures, items, monsters, spells, etc from any d20 SRD licensed resource are compatible with the Microlite20 system.
Pro Clear writing
The writing is very terse and to the point. There's very little in terms of fluff. As such the rules are easy to comprehend and reference.
Pro Simple rules allow easy customization
m20 remains compatible with the d20 SRD, but rules are lite enough that adding modifications to the system is trivially simple.
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 Combat can potentially get stale
Due to the fact that combat is simplified to just 3 variables (AC, HP and attacks) a less experienced DM runs the risk of creating repetitive combat.
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.