Wilier Izoard XP Veloce £1350 or Wilier Montegrappa Sora 9sp

Hi I need some help, I newish to the road cycling scene & need to upgrade my carrera tdf. I have a couple of choices from Wilier Montegrappa Sora 9spd at £775 or Wilier Izoard XP Veloce £1350. There is obviously a large price difference but is the additional cost worth it? Any advice and help is much appreciated!
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As a first proper road bike it is perfect. If I had the money I am sure I would buy further up the range.
£600 is a big jump in budget so I'm sure the Izoard would be more up-grade proof.
I am enjoying my Monte and up-grading bits to make it more personal: seat,stem,post and wheels.
When funds allow I will be purchasing a GranTurismo and the Monte will be my 2nd bike.
Wiliers: Cento Uno/Superleggera R and Zero 7. Bianchi Infinito CV and Oltre XR2