Speaking only for myself, I'm on multiple Slack channels, some related to certain SaaS companies whose products we use, and some that are personal. Internally,

Speaking only for myself, I'm on multiple Slack channels, some related to certain SaaS companies whose products we use, and some that are personal. Internally, we use HipChat for our group within the company. I much prefer HipChat over Slack. To me, Slack is bloated, slow, and disorganized. I hate, loathe, and despise the way it tries to do what it thinks of as "threading". HipChat is simpler and faster to use. It's easy to connect plugins and administer. It's easy to add your own custom emoji, if you really need them. And it's easy to configure it to auto-hide animated GIFs, if you don't want to see them by default. There is nothing that Slack offers that I want. And plenty that it forces me to live with that I do not want.