Go for Shimano double (R8000 46-36 chainset is mega). 1x requires a chainguard for when it gets muddy and even then it isn't great for chain retention when racing. GRX is designed for gravel, not CX.
Is a 2x grx derailleur inferior to the older rival shown above ?
Anecdata: GRX (810) has been noticeably poor at keeping the chain on the ring on a 1x setup (benchmark was SRAM Force 1 on previous bike).
@leggy_blonde started
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Go for Shimano double (R8000 46-36 chainset is mega). 1x requires a chainguard for when it gets muddy and even then it isn't great for chain retention when racing. GRX is designed for gravel, not CX.