I'm happy with the changes made to paladin, particularly that the other smite spells now have a reason to exist. I have one small change to make to the Paladin's Smite feature.
Choose Divine Smite, Searing Smite, Thunderous Smite, or Wrathful Smite. You always have the chosen spell prepared. In addition, you can cast it without expending a spell slot, but you must finish a Long Rest before you can cast it in this way again. Subclass features that normally work with Divine Smite, such as the Oath of Devotion's Smite of Protection ability, instead work with the chosen spell for you.