As the OP doesn't do track days, I can't see repeated stops from 150mph will be a feature of his driving. Perhaps we should be asking what is wrong with the current setup, before making recommendations..?
order of importance.
caliper/pad/disck/fluid/lines.
check the caliper if its not sticking move on,
check the pads, not worn or glazed move on,
check disck brembo recon 1mm per side before discs are junk, move on
fluid change yearly with decent fluid, move on
check for leaks/air bubles, sorted.
for daily use:
pagid discs and pads will be fine.
along with some decent fluid bleed through properly.
fast road:
at least up rated pads and fluid,
personally id recomend ds2500s(i had red stuffs and the 2500s dont need warming and stop no mater what)
fluid, some decent fluid, castrols react/ate super200 etc
Track days,
new calipers: stock 288s are pathetic even with best pads/discs etc minimum upgrade is 312mm off an anniversary mk4 golf.
then some decent discs and pads and fresh fluid.
Race,
R32 2piston 343mm
Brembos LCR 323mm 4 piston
porsche brembo 330mm 4piston.
ds2500/ds3000 pads/ mintex 1155.
good quality discs, with high carbon content
fresh fluid.
braided lines.
BUT all this is pointless without decent rubber on the car, you could have a race setup and budget tyres and ull still be out braked by someone with decent rubber.
for the OP;
your on
cupra net so im going on a limb u have a
cupra tsi with the 288mm single pot brakes not the Race brake option(factory optional "race brakes"). your not doing track days and you want decent stopping power no mater what.
in which case:
discs- some OE eicher discs
pads- EBC blackstuff- OEM spec
and fluid- Pagid Dot4, ull need 500ml to change fluid in all 4 brakes.
OR if you like spending more for the same shite
but thats just my opinion.