I built a project with different types of compression and here are the results:
Webp - 428 MB
Basis uastc - 296 MB
Basis etc1s - 161 MB
I don’t remember why I chose webp at the beginning of the project development 
I read in this forum thread that etc1s is no longer relevant, will it also be removed or did I misunderstand?
The compression size with etc1s is impressive!