To remap PS5 controller buttons, go to Settings > Accessibility > Controllers > Custom Button Assignment. Enable custom assignments, select “Customize,” and adjust buttons as desired. Save changes, ...
The PlayStation DualSense is already a pretty feature-packed controller. With it, you get extra doodads like the touch pad, ...
If you want a second controller for your PS5, a third-party one can help you save a few bucks over the DualSense controller.