I think this depends on the type of player that you are. I like starting early, but I've seen that even if I gie u AA in the first 3hands it's difficult to really cause damage to your opponents because the blinds are small, if you raise too big, people will get suspicious and run (fold). If you mine raise, okay someone might connect but still it's difficult to stack people early on. I've started registereing late and it's a whole ball game, the aggression, stealing of blinds etc, that's what I enjoy doing and it's very easy to double/triple up if you just wait for the right spot