To me, Pit's are the best dog. I trust my pit with children more than any of my other dogs. If you get them while young, properly socialize them with or children and other dogs, and train them properly, you will have the best dog period. They (as all other dogs) are a reflection of their upbringing. If they aren't use to kids and other dogs then you may have an issue, but if introduced to EVERYTHING from a young age, they will be great dogs. The bad thing about Pit's is not that they are "aggressive" is that they are powerful, and this put into the wrong care can equal bad things. To me, Chihuahua's are way more aggressive than Pit's, difference is you can literally swat a chihuahua away, but a pit isn't so easy.