Is a shorter subdomain better?

[BlueLinkERP]

For example, consider the two subdomains below:

learn.bluelinkerp.com

learnmore.bluelinkerp.com

Would there likely be an appreciable difference between the two based on length alone?

Also, would it be better to use a term that relates to our product in general such as "software.bluelinkerp.com"?

Thanks!

[EGOL]

From my experience....    bluelinkerp.com/learn/     or    bluelinkerp.com/learnmore/

would be kickass compared to using a subdomain.

Why?  All of your authority is concentrated in the root of your website instead of being divided into subdomains.

[Asher]

I agree with EGOL.

[wickedsunny1]

Hello,

Had a bad experience making 4 subdomains , PR dropped from 6 to 5, search engine traffic fell drastically.

now i redirected them to sub directories.

so i suggest go with sub dirs instead of subdomains.

[Anita_Clark]

Go with subdirectories over subdomains for the reasons already mentioned.  Also, a shorter URL is easier for consumers to remember so take that into consideration when coming up with your naming convention.