Resetting and Iphone

I am going to give my old Iphone 4s to someone, but I want to clear all of my information.
I got as far as Settings, General, Reset - after that do I pick "Reset All Settings" or "Erase all Content and Settings".
Thanks in advance for any help.

Erase all content and settings, because you want to get rid of personal info, pass codes, credit card info, photos, contacts. Reset all settings only returns you to factory settings.

I recommend doing a restore through iTunes. Reloads software entirely.

Or you could do Settings > General > Reset > Erase All Content and Settings. Which will wipe it all from phone as well.