Seems that Spigot (branched off of bukkit) started maintaining Bukkit and CraftBukkit since the DMCA takedown.
Apparently you can use next to all bukkit plugins with spigot as well.
Meaning using spigot would be the best option imo (sponge is awesome, but has not matured enough just yet).
When the Bukkit.org project ceased operation in Q3 2014, the SpigotMC
team took over providing continued support and updates to this important
software with a rich legacy. CraftBukkit is a modified version of the
Vanilla Minecraft Server which allows it to run Bukkit plugins. The main
goal of this project is to produce a server as close to Vanilla as
possible, barring the addition of plugin support. That being said
CraftBukkit still retains some useful configurability and optimizations
such as asynchronous chunk loading, and also fixes for some critical
Vanilla bugs or exploits. All installs of Spigot via BuildTools
will also generate a CraftBukkit jar file in case you wish to use this
over Spigot (although we hope you will find no reason to).
In addition to CraftBukkit, we also now maintain Bukkit which is the API
that developers can use to make server plugins. Over the years we have
added many new features and changes to support newer Minecraft versions,
but much of the older Bukkit documentation such as the Plugin Tutorial
is still extremely relevant for developers just getting started. More
information about using the API can also be found under the Spigot wiki section.
The post was edited 1 time, last by slotty ().