There are not 2 "Maven Builds". There are 2 run options for Maven: "Maven Build" and "Maven Build...".
The convention with menus on GUI applications is that if a menu command is followed by 3 dots (ellipsis), then it will prompt for further input (typically a dialog box).
The Eclipse Run/Debug subsystem allows you to define multiple run profiles and that is just as true for tools such as Maven as it is for your own Java applications. The "Maven Build..." allows you to construct and use these alternative run profiles by presenting the Run/Debug options dialog. The "Maven Build" (no ellipsis) is a fast-path request for the default build profile.
Bjoke: A "Bully Joke". A Statement or action made with malicious intent - unless challenged. At which point it magically transforms into "I was just funnin'" or "What's the matter, can't take a joke?"
You showed up just in time for the waffles! And this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop