Full disclosure, my experience is with a bit older version of both Overviewer and dynmap, but a quick glance at them suggests they haven't changed much. Key di

Full disclosure, my experience is with a bit older version of both Overviewer and dynmap, but a quick glance at them suggests they haven't changed much. Key differences: Overviewer's web interface is much better. Smoother & faster. And the rendering quality is also superior to dynmap's. Dynamp is, however, dynamic. Overviewer is an offline renderer, basically. You need to cron-job it or whatever, so there are delays in the map updating. Dynmap, on the other hand, is a plugin to the server itself, so it updates whenever a chunk in the game updates. This is how it also is able to have player locations and chat and stuff. But this also requires plugin support to use dynmap. Overviewer can easily work with hosted solutions. You can pull down a copy of the world from your hosted minecraft instance and run overviewer on it nightly, so you don't have to take on hosting minecraft yourself. However, if you are going the modded-minecraft route (FTB or whatever), dynamp is low-effort and since it uses the game engine itself to render has built-in support for all the crazy textures & blocks that mods add. Overviewer does not. tl;dr: If you're running vanilla Minecraft, use Overviewer. If you're running modded Minecraft (FTB, Technic, etc...) use Dynmap.