It's a bit of a programming term, sorry for not explaining myself. Basically, because AHK was originally very limited and basic, language design wasn't taken as seriously as it ought to have been, which is to say they didn't keep in mind things like future features or extensibility when they created it, thus ending up with a language that is not as uniform as it could be. In AutoIt's case however they took it a bit more serious and have ended up with a language that is much neater and easier to read and write. Also, if you're not adverse to having a slightly more complicated language to deal with, I would recommend Perl
over both of these, though you have far more overhead if you want to compile your scripts to executables at any point, but then Perl scripts are cross-platform
compatible unlike AHK or AutoIt.
Hope this helps, Ehtyar.