Upgrade from a Giant Defy Composite to an Advanced am I Mad?

Hi all,
A couple of months ago, I bought myself a Giant Defy Composite 2.
I love the geometry but I not really getting on with the SRAM apex. I had a go on a mate's advanced and it seemed a fair amount better, though I don't know how much is just upgradeitis. Would it be be worth the cash to upgrade (to the advanced 1) or should I just change shifters and mechs ?
Many thanks
A couple of months ago, I bought myself a Giant Defy Composite 2.
I love the geometry but I not really getting on with the SRAM apex. I had a go on a mate's advanced and it seemed a fair amount better, though I don't know how much is just upgradeitis. Would it be be worth the cash to upgrade (to the advanced 1) or should I just change shifters and mechs ?
Many thanks
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Cannondale Synapse Sram Red ETap
Winter - Boardman CX Team (Rival X1 Hyd)
This would be less costly than changing bikes?
I will let you do the math.
My dodgy maths was price difference ~ 1K :shock:
Though ~£500 for full ultegra - £200 for better wheels which means for £300 you get the stiffer front end, tweaked geometry (2013) with higher modulus carbon and a better finishing kit all round (plus fancy extras like built in cadence, hidden cables etc)