Originally Posted by HBHoss
There are different styles of Bock beers. Light (Maibock) and dark (Heller).
These are maltier, high alcohol German beers. Low to no hop aroma and sweeter tasting. Actually they are Lagers and brewed as a Lager.
I was always under the impression that Maibock and Helles Bock were effectively synonyms. Heller actually means light (like a Helles). BJCP 2008 Style Guidelines - Category 05
While regular bocks (and doppelbocks) are lagers, weizenbocks are generally brewed as ales (although I have a strong, dark wheat lagering now). This is why they tend to be made by brewers best know for their hefe (Schneider Aventinus, Weihenstephaner Vitus etc…)