Most compliant hardtail?

[Dorthbison]

I’m looking to build up a new hardtail mountain bike (https://freshbikescycling.com/hardtail-mountain-bikes/) and wondering if there anyone suggest me which frame is most compliant in the rear. I think BMC and trek have handrails with some added compliance in the rear, but I’m not a fan of either brand.
Thoughts and recommendations appreciated.