How does lz-string compare to platform CompressionStream?

[Fuzzyma]

I am wondering if the functionality of lz-string can be nowadays mirrored by a CompressionStream.

Can anyone weight in on that topic? I naively compressed a bit of html using gzip and converted it to a format I can use in the url (since thats what i need) and the compression ratio of lz-string was about 1.5 while my naive version had 2.26.

Totally possible that I did something wrong but I wanna know if you people know of any downsides in regard of CompressionStream or any upsides with lz-string.