Is there any value to a home page URL adding the /index.html ?

[theideapeople]

For proper SEO, which version would you prefer?

A.  www.abccompany.com

B.  www.abccompany.com/index.html

Is there any value or difference with either home page URL??

[TellThemEverything]

A because it's easier to read - use the rel=canonical tag to "redirect" index.html to /

or do a real 301 redirect. the key here is to only have one of these indexed, or you will get duplicate content.

[USHoleInOne]

Correct, I would use a 301 re-direct from B to A

[AdiRste]

Always go for A.

If B still appears then 301 that page to A.

If you struggle with conducting a 301 then you can set your preferred domain in Webmaster Tools.

[DanSpeicher]

A.

URLs are best when they are short and static.

Shorter URLs are more likely to be shared, typed-in, and they look better.

Make sure there is only one website version like James said.