there are a few differences between the glanza 4efte and ep82 4efte, most of the changes were chosen to produce better reliabilty and better running, and cheaper to make. the changes are mainly internal, and with the ecu.
the ct9 is also slightly better than the stock ct9.
the glanza carries a bit more bulk than the gt, yes but is no slower, this is due to the changes that have been made between the 2.
i#m 99% certain people dont put the glanza engine in because they think it produces more power, i'm sure it's because it was easier to get hold of, or was just what was available at the time.
toyota didnt want the glanza to have more power they wanted it to have better driveability, and imo they done exactly that, the gt is much more raw and more of a drivers car, the glanza is more subtle i may be as bold as to say slightly more boring, but toyota done what the market wanted them to do.
obviously once you start tuning them all of the above goes out the window, and imo the only thing better than about the glanzas is the aerodynamics, but even that improvement is probably nothing to shout about lol,
people have the right to choose what they want to drive, i like all starlets but prefer the gt, most people on here are the same view (not necacerily with gt's but might like all starlets but prefer glanza's etc)
i'm not exactly sure what you hoped to achieve by posting this thread, but would like to urge you to think before posting, there is a lot of people losing patience with you very quickly.