This is super org-dependent -- my entire org has completely switched to Slack, I only use Chime for meetings now (except for the occasional recruiter or someone outside my org who will ping me on Chime).
Switching to slack was brought up in our org and most people were at best noncommittal, because the option wasn't really "chime vs. slack", it was "chime vs. chime AND slack".
We'd still all need chime for meetings and interacting with any groups that hadn't switched.