The Core Difference: Rulings vs Rules
5e asks the DM to make calls. PF2e gives you a rule for everything. Choose based on your DM style.
D&D 5e was designed around "rulings over rules" — the DM is expected to adjudicate edge cases on the fly with ability checks and advantage/disadvantage. This makes 5e faster to run but puts more weight on DM experience. A new DM with a rules-lawyer player will struggle; an experienced DM with a casual group will thrive.
Pathfinder 2e takes the opposite approach: if there's a situation, there's a rule for it. The three-action economy means every turn follows the same logic (one action to move, one to attack, one to raise a shield or demoralize). The encounter-building math actually works — a Severe encounter is severe, a Low encounter is low. The trade-off: more reading, more tracking, more time per turn. But the payoff is a system where DMs don't need to invent mechanics on the spot.
Character Building: Broad Strokes vs Deep Customization
5e characters are ready in 10 minutes. PF2e characters take an hour but you won't outgrow them.
In 5e, most character-building decisions are front-loaded: race, class, subclass (usually by level 3), and a feat every four levels if you skip ASIs. The result is broadly competent characters with a few signature abilities. This is great for new players and one-shots — you make three choices and you're ready to play.
PF2e characters make choices at every level: class feats, skill feats, general feats, ancestry feats, and spells. A level 10 PF2e character has made dozens of meaningful mechanical decisions. This is overwhelming for new players but deeply satisfying for tinkerers. No two characters of the same class play the same way, and the system's tight math means your choices matter without breaking the game.
Encounter Building: Guesswork vs Math That Works
5e CR is a rough guideline. PF2e encounter budgets are reliable enough to build sessions around.
5e's Challenge Rating system is famously inconsistent — a CR 5 creature might be a speed bump or a TPK depending on party composition, magic items, and how many encounters the party has faced that day. Experienced DMs learn to eyeball it, but new DMs learn through mistakes. The "adventuring day" (6-8 encounters between long rests) is a design assumption that almost no table follows.
PF2e's encounter budget system works. An 80 XP encounter is moderate. A 120 XP encounter is severe. The math is transparent (creature level - party level = XP value) and the results are consistent. More importantly, PF2e doesn't assume attrition — each encounter is balanced to be a complete challenge on its own, which matches how most tables actually play.
The Honest Answer: A Table-Based Decision Matrix
If your table loves tactical combat and deep builds: PF2e. If your table wants fast onboarding and improvisation: 5e.
Pick 5e if: you have new players, you run mostly theater-of-the-mind, you homebrew a lot, you want the biggest third-party content library in the hobby, or you play in organized play (Adventurers League). Pick PF2e if: your players optimize builds for fun, you want encounter math you can trust, you play on a grid, you prefer a system that balances itself (no DM fiat needed to rein in overpowered builds), or you want all rules legally free online (Archives of Nethys).
The community's most repeated advice: try both with one-shots before committing a campaign. Both systems have free starter adventures (Lost Mine of Phandelver for 5e, The Beginner Box for PF2e). The "better" system is whichever one your group actually shows up for.