Bike purchase advice please

Hey all,

I have been looking to upgrade my first cheap b’twin road bike. Looking at a 2018 Roubaix Sport at £1400 or a Defy Advanced 3 2019. 


The roubaix has mechanical discs with 105. The defy has tiagra with hydraulic discs. 

Is a better groupset a better place to put money or brakes?


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