Founder of Streak here, happy to answer any questions but in my highly biased opinion Gmail/Inbox/Gsuite is the way to go. Pace of innovation is fast, good APIs

Founder of Streak here, happy to answer any questions but in my highly biased opinion Gmail/Inbox/Gsuite is the way to go. Pace of innovation is fast, good APIs, ecosystem of products (like Streak) is getting stronger by the day.