If you strip it all back to the bare bones components then there’s little between the A3, Golf and Leon in the bare metal.
The Cupra has the added expense of the R engine internals and bolt ons, PP/CS/TCR diff, PP/CS/R brakes, DCC, standard 19’s, etc etc
It does without various luxuries like the gas strut bonnet lifter and some slightly nicer internal fittings.
The TCR and CS don’t get slated on here (running the same engine and tune) for the lack of traction. The off the line issues are more to do with the level of torque going through the front wheels which will be a similar number between the PP and Cupra, TCR etc . The VAQ will cope with it all on both Golf and Leon once on the fly.
The PP will be better on fuel and the Cupra will perform much more satisfactorily at higher revs, the latter being more important to a performance car enthusiast in most cases!
The Golf styling more classically pretty, the Leon more edgy and in nicer colours.
Ya pays yer money...
Moving “back” (or paying significantly less retail cash) from a less equipped A3 to a Leon I can understand the concerns over lack of padded interior niceties in the Leon, but between a Golf and Leon there ain’t much in it.
Considering a brand new 290 PS Cupra can be had on Broadspeed for just over £24k which is Polo GTI money (when taking into account you have to pay for paint and nav on a Polo) it’s not a bad proposition.