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If I remember correctly, Redshift became more cost-effective over Snowflake the larger your compute got.

Snowflake would just run an EC2 instance in the background for compute, and the very largest EC2 instances were more expensive to run than a Redshift cluster of similar power.

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Snowflake is most definitely running multiple instances for anything but the smallest clusters. It's plausible that one warehouse might scale better as you increase the number of nodes but I would really be surprised if there was a big difference---the techniques for query execution are pretty well-known, so Redshift and Snowflake are probably doing the same things. I did a benchmark I while ago [1] and I'm definitely planning on adding multiple scales to evaluate how they compare as you increase data size.

[1] https://blog.fivetran.com/warehouse-benchmark-dce9f4c529c1

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