Best way to view Messages?

Quick question...on my way to work, but could use some info.

Recently signed up, and was looking around about setting up my profile and stuff.  When I click My OH, Settings, then Message Board, there is an option:

Most recently created topics first or

Topics with most recent posts first

Is there some advantage to doing it one way or the other?  The default is Most Recently Created Topics first.  How do you have yours set up and why?  

Also, if anyone can give me tips on re-sizing a pic, I'd appreciate the info.  I use a Mac, but not too computer efficient.

Thx.