Jpg at 70% will lose a significant amount of detail. It is a “lossy” format, you cant judt compress data for nothing.
AVIF is significantly more efficient than jpeg, so it loses less image data for higher compression (smaller file sizes).
JXL supports both lossy and lossless compression, and is supposed to be more efficient yet over AVIF. However it’s got proprietary all over it because Google et al. For thst alone I would shy away from JXL and go AVIF.