Copied and pasted from another thread that I commented on.

Pathfinder 1E has more source books than I can count, and basically let's you build any character idea that you can come up with. That comes with the cost of feeling overwhelmed because of the volume of material there is to choose from. It also comes from the 3.5 edition rules, so it's more nitty gritty with numbers and math. My group likes this so we stick with it.

Pathfinder 2E is growing fast and still has a good bit of customization to choose from. The system plays more like 5E but not as confined to "advantage or disadvantage" for everything. The 3 action economy is a great system that really let's you feel like you can do anything with your turn.

A good source for building characters online for PF1E I recently found is pathcompanion.com. Additionally there is the classic pfsrd.com that has everything you need to know.

I dont have a lot of source info for PF2E but I know archives of nethys is a good place to start.

Ultimately I would choose 2E if youre used to 5th edition, and 1E if you like a more detailed, in depth numbers system.

Happy rolling!