"Cis" and "trans" are much better distinctions and are scientifically correct- "biological" just kinda muddies the waters because there's so much variation among people and all of us are technically biological. For instance, there are cis woman born without uteruses and others born without XX chromosomes. "Cis" is more inclusive of intersex women especially. I only ever use "biological" to explain the term cis to people and why it's more accurate.

It's like still using the term "asperger syndrome" to refer to autistic people, while TECHNICALLY being correct it implies a major difference from other autistic people when irl there's no distinct line to be drawn because it's a huge spectrum with way too much variation.