From the article:
Mastodon is a great microblogging platform, but maybe you want to try something new. Firefish made a splash recently, and a lot of people are talking about it. If you’ve played with it for a while and want to officially take the plunge, here’s some tips on moving from your Mastodon Instance to a Firefish one.
Some of the differences are justthings an instance an admin can change on Mastodon, such as
But there are things that would require a Mastodon admin to to fork and modify, too
It’s ultimately just another front-end to ActivityPub and the Fediverse. Use whichever one suits your preferences as they can see and follow each other regardless.
AFAIK mastodon has a hard limit of 500, changing it would either require source code modding, usage of a fork or using another software