ive driven both mate as i was also considering buying both. i drove a 1.4 sport first which i wasnt impressed at all with, seemed gutless. this made me consider the tdi. bearing in mind its only a 3 cylinder it has a nice wee punch of torque which chipped would be even better! even though it was a high miler dog it still pulled quite well. i then test drove another 1.4 sport which was like night and day between the other sport id driven. i came to the conclusion the first sport id driven had been ragged sensless and there was something wrong with it. i went ahead and bought the second 1.4 sport i drove and am very happy with it. so the best thing to do really is go and test drive both and make your own mind up, but make sure its a good healthy example and hasnt been thrashed silly! Grant