I am assuming you are comparing D&D5e and pathfinder 1e, if we are talking about Pathfinder 2e, it has more robust and balanced game mechanics. At least for me and my table, it´s vastly superior to the other two.
I've just started getting into the world D&D and Pathfinder since BG3 early access was launched so I'm not too sure the editions I'm reading. I pretty sure the Player's Handbook is 5e. Not too sure on the Draconomicon though. I also didn't know there was a Pathfinder 2e. I've just been reading the Core Rulebook. The books I've been going through are D&D: Draconomicon, Player's Handbook, and Eberron and Pathfinder: Core Rulebook, and Campaign Setting Technology Guide
I've also been going through the sites D&D Beyond, DND 5th Edition wiki, and d20pfsrd.
Do you have any recommendations for me?
Oh yeah, the Pathfinder 2e came about two years ago. 1e has much more content, that one lasted for +10 years (until 2018 or so). The new one has a few books and an advanced class manual. Paizo will publish 2e from now on, so we could expect more content.
It has different mechanics and settings, lore, races...from D&D and the first edition, but still uses the traditional d20 dice.
About D&D, if you need more knowledge about the ruleset (because you want to DM or try new things) the Dm´s guide, the Tasha´s cauldron and the Xanathar´s guide are a must. If you are more into lore and stuff, try the Van richten (its about the Ravenloft setting) Volo´s guide of monsters, the Sword coast guide or GGO of Ravnika. Many people like the ones of Theros or Wyldemount.
