There is a 3rd alternative...
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Why choose Spike or Bitrix24?
Both competitors offer free versions and add-ons, and have contact management and chat features. However, Spike has additional features such as graphic personalization, custom domain name, voice messages, and GIF and emoji options. Bitrix24, on the other hand, has more features such as poll, recording, online document editing, and newsfeed. Bitrix24 also offers training webinars and integrations with API, while Spike offers on-site and online live training. Overall, depending on the specific needs of the user, both competitors have their strengths and weaknesses.