From my personal view, for a small business, limited free plan with no ability to build landing pages even with paid plan are big downsides. As a small business, you want to save as much as possible, using as little as possible.

I believe MailChimp and MailerLite offers best conditions for a small businesses – great free plans with major features included (MailerLite gives all features for free). You should definitely look into that. Would love to hear your opinion 🙂