Disclaimer: I only have ~4 months experience with React and ~1 month with Preact.
Given that you're rendering server-side and primarily switching to improve the read/writability amongst the team, I definitely "thumbs up" Preact. Their focus on perf will align really well with serving content from the server and, as already covered in other comments, you don't lose anything that you'd need from React.
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Disclaimer: I only have ~4 months experience with React and ~1 month with Preact.
Given that you're rendering server-side and primarily switching to improve the read/writability amongst the team, I definitely "thumbs up" Preact. Their focus on perf will align really well with serving content from the server and, as already covered in other comments, you don't lose anything that you'd need from React.