My drafting experience includes 4 yrs in high school (20 yrs ago) and whatever else I passively picked up along the way reading simple drawings, etc.

I am setting up my document templates, and i'm not sure which dimensioning standard to use: iso or ansi. I am setting up one template for inches, and one for metric. Should the standard correspond to the units (ANSI with inch, ISO with metric), or does it matter? I prefer ansi as that is how I am used to seeing the extension lines, arrows, etc.

Thanks,
Shane