Definitely buy them instead of buying the deco separately (if you care about decorating)
You need to have a bit of patience, but you will get an unlimited supply of the decorations they drop for only 100/110 Gems.
Some of the decorations :
On the left are the Lovebeast Pup drops (Wedding Path, Wedding Wall, Wedding Tower, Wedding Arch)
On the right are the Direlove Piglet drops (Sweetheart Path, Sweetheart's Fence, Sweetheart's Pillar, Sweetheart's Gate)