I've worked with Uberflip as an individual, with a large multi-national company and a medium-sized non-profit. I would say that most solopreneurs should probably stick with MailChimp or MailPoet. When you have a good budget for marketing, definitely consider a move to Uberflip. I've also used Pardot by SalesForce and it's very comparable. I believe Hubspot is easier in the beginning than Pardot, while Pardot has better connectivity to outside systems (like SalesForce, of course).
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