One big difference between DnD and PF on a more meta side is that all the PF rules are legally FREE! Only the lore stuff (Lost Omens) and the adventures are copyrighted, but the rules, character options, monsters, etc are all FREE!
You can read everything on here: https://2e.aonprd.com/Rules.aspx
And this is a nice free character tool: https://pathbuilder2e.com/
In a nutshell, Paizo wants you to play their games, while WotC wants you to pay their games first of all.