The feature that makes me love pulumi is crd2pulumi, it generates simple, type checked and documented libraries from CRDs.
E.g. these are the libs I use, generated from CRDs: https://github.com/Extrality/pulumi-crds
E.g. these are the libs I use, generated from CRDs: https://github.com/Extrality/pulumi-crds
terraform with helm/kubernetes/kubectl providers is hit or miss. But I love it for simple things. For hairy things I will want full TypeScript with Pulumi.