When comparing 13th Age vs Warrior, Rogue, & Mage, the Slant community recommends Warrior, Rogue, & Mage for most people. In the question“What are the best tabletop RPGs?” Warrior, Rogue, & Mage is ranked 11th while 13th Age is ranked 27th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro The game is built for people who've done it before
The world is half built, letting you get in and leave your mark. Each class plays mechanically different than other d20 versions. Skills are placed by backgrounds. It's a short hand and interesting way of playing DnD.
Pro Long lists of skills are gone completely
And covered by backgrounds (much like FATE or Cortex+) so that players aren't searching through lists of skills and what they can do constantly.
Pro Gonzo without the grid
13th Age has some very gonzo fights with party combos, lots of variable powers for monsters and PC's but as a simple set of rules for combat that speed it up without losing a lot of options.
Pro Light ruleset
Pro Easily expanded and adapted
Pro Beginner-friendly
Pro WR&M derivatives can be shared and even sold freely
Released under the Creative Commons Attribution 3.0 Unported license, which means you can create WR&M derivatives and share them freely or even sell them. It’s the same open license Fate Core uses.
Pro Good if you like Simulationist RPGs
If you like RPGs putout by the big publishers, you will probably like this game.
Cons
Con Too similar to 4th
Con The Icons and the PC relationships to them can confuse
Can be confusing, especially for new players.
Con It doesn't really do anything new, it just looks pretty
Con Simulationist
GM-based
Unequal distribution of authority
If you like Story Games (i.e. GMless, Collaborative RPGs) this is not for you.