The verdict
For a small B2B team, pick Manychat if Instagram, WhatsApp or Messenger already brings you enquiries and replies are your bottleneck. It answers common questions, collects email addresses and phone numbers, and hands real conversations to a person.
Pick Skai only if you manage a very large ad budget across retail media, search and social and have a team to run the platform. Its entry tier assumes ad spend in the millions each year.
If your customers mostly reach you by website chat or email, neither fits well. Look at a chat tool instead. If you only need to run a few paid campaigns, the native ad platforms do the job.