The Vox FitnessWhey isolate at $60/kg and pea-rice blend at $25/kg produce similar resistance-training outcomes when matched for total protein and leucine.
The 2x price premium isn't backed by outcomes. It's backed by marketing budget and shelf space.
Cass IronsSource: Lim et al. Nutrients 13(2):661, 2021. Meta-analysis of 18 RCTs in resistance-trained adults. Plant-based and animal-based protein produced equivalent lean mass and strength outcomes when total protein and leucine content were matched. DOI 10.3390/nu13020661.