Trek Procaliber 9.7 2020 model or Giant xtc advanced 1 2018?

I am looking to replace my current XTC advanced 1 2015, which my son has grown into. I fancy the Trek but Paul’s cycles have a XTC Advanced 1 2018 in the sale for about £200 more than the Trek, with a much better spec. Has anyone got any opinions on either of these bikes. To be used for xc racing and trail riding.
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Reviews on bike magazines etc. only usually test them for a short time so won't know bikes in as much detail as someone who owns one.