I don't read up all (any) of the gossip stuff, but I think it is funny when people talk about the celeb's personalities. I guess you can get a general feel of what they
might be like by watching the news or interviews, but I don't buy into it. Remember, these people are paid to act, and I doubt that during interviews and such they are always going to portray what they want people to see them as, so unless anybody has hung out with them, or talked to someone who has, I don't know that we can get a good feel for personalities.
NOW, with that said, I'd take on the debate any day that Jen is "nicer" than Angelina. The selfless stuff I've seen her do around the world seems way more nice than most of the stuff I've seen Jen do. My opinion: I think people apply their looks directly to their personalities. Jen has that "nice girl next door, bring home to mom look" while Angelina has a much more rebellious look (and her younger years were a bit crazy).
I think the bottom line is this: I'd trade them both for Jessica Alba.
By the way, my wife agrees with all of the above, but she likes Jennifer Garner better than all 3.