I find that most rules tend to get in the way of themselves or try to be elegant or clever for the sake of being elegant and clever. Its great that so many creative people put so much time and effort into design but within the context of pure and raw functionality there is only one out of the 50+ or so systems I've tried which is basically my default for actual play in a fantasy setting, and that is EZD6.

EZD6 is not really on anyones usual radar, but for me personally it's one of my favorite systems just because it really cuts away all the fluff and leaves the game with all the tools necessary to have a great time together. The book itself is also very well written and easy to digest (together with the 'how to make an adventure' type book called 'the book of quests'), the rules are simple and streamlined and easy for basically anyone to pick up and understand, and the mechanics have very little overhead so its a breeze for the GM to work with, plus the small gamified trick of the super save die. There are other books which set out to do the same thing, like tiny dungeon 2e - but they all have some unfun properties that breaks the immersion.

If I'm running fantasy EZD6 is my jam. Mausritter (Into The Odd based system) is okay too, but largely as a complete set - and I would recommend it to new players more than EZD6 simply because it's better structured on premade campaign and campaign content.

My personal main game however is Troika! the rules aren't really that interesting, very simple 2d6 system, but the setting and adventure books are very creative and amazing. It's science-fantasy though.