They’re both adjectives, but we have preferences. No, ‘cis’ doesn’t imply that trans people are better. ‘Cis’ implies that trans people are equal. People who object to this equalization are transphobes.

OK, said the pack of hungry tigers. A slogan like ‘Biological first!’ might not work out so well for them. If we’re tied up by hungry cartoon tigers, our best bet is to untie each other.

The ‘soup can logic’ of using ‘trans’ but not ‘cis’. When people aren’t comfortable observing that some people are cis, often their discomfort rests in a belief that trans people aren’t people but soup cans.