Standard.dwt is the default.  Most likely it is set up to use decimal inches as the default units.

Standardiso.dwt is probably for users of metric units.

Four look to be based on different international standards: standardjis, standardansi, standardbsi, and standarddin.

As for standardgb and standardgost I couldn't tell you.

Open each one up and see if you can notice any obvious differences. 

OK...standardjis.dwt adheres to the Japanese Industrial Standards.

Standarddin.dwt adheres to German standards.  Deutsches Institut fĂĽr Normung", meaning "German institute for standardisation."

Standardansi.dwt adheres to the American National Standards Institute guidelines.

Standardbsi.dwt adheres to the British Standards Institute guidelines.

Is that enough information for you?

BTW, you are aware that you can create your own template and populate it with the layers, text/dimension styles, linetypes, etc. that you want right?  You can also set up a sheet with your own title block and border to be part of the template.

Since your profile lists your location as United States then unless you or your company does international work I'd stick with the default template.


Edited by John Connor - 08.Aug.2013 at 18:32