I second Impale. In early HC seasons when powercreep wasn't as ridiculous and I had no clue about anything I always went for Impale for the high GR clears for journey etc, tried several specs of several classes but Impale was by far the one that was safest. You can beef up the defense indefinitely without sacrificing too much and be almost unkillable for GR70-80, so I think it will still be quite tanky on GR90-100, especially after this recent patch added some more power.
I second Impale. In early HC seasons when powercreep wasn't as ridiculous and I had no clue about anything I always went for Impale for the high GR clears for journey etc, tried several specs of several classes but Impale was by far the one that was safest. You can beef up the defense indefinitely without sacrificing too much and be almost unkillable for GR70-80, so I think it will still be quite tanky on GR90-100, especially after this recent patch added some more power.