Also not sure on colour.
I think the snazzy bluey purple colour, or maybe white
Worth a watch if you're deciding between the two :-
Aesthetically I kind of prefer the MK7's exterior. Mainly as I feel the smoothed in colour coded side skirts look better than the black under sill ones of the MK7.5. To be fair though they look very similar other than the wheels in that video don't they!
In terms of tech the Mk7.5 is the marginally better car by way of having a newer 7-speed DSG (assuming you go automatic) versus the 6-speed of the MK7. Also the infotainment is far more modern on the 7.5 with it's digital instrument cluster and Apple Carplay/Android Auto infotainment support IIRC.
Obviously if you have two identical cars at the same price then you'd definitely want the Mk7.5 for the 7-speed and upgraded infotainment. Just a case of deciding how much those features are worth to you really IMO and which you prefer the aesthetics of. As said though I would judge the cars you look at by their condition, mileage and history rather than worrying too much about which specific version it is.