if you click it it will disappear, if you click the message box when unsure you got a message you will find out if you have any,lol
no difference in my opinion.
personally our message box flashes wayyyy to often, annoying enough as is, i have no problem in noticing when it flashes myself.
-1 from me
edit: last time i played using my better halfs kindle when my lappy was down, the msg icon actually had numbers on it saying how many msgs you had unread, found that even more annoying because some msgs i dont even read if it does not concern me lol. hope they got rid of that one haha