Clover is a robust system with all the bells and whistles and is designed for multi-location businesses. Multi Locations are integrated into one reporting portal. Many app integrations are available on its marketplace. It is trusted by 6,000,000 merchants worldwide. Choose your own payment processor and negotiate rates and fees. Gift and loyalty cards can be integrated.
DejaPayPro is designed for the mom and pop one-location shop. It is inexpensive, but plenty powerful for a one-location business. Gift and loyalty cards can be integrated. Dejapaypro can integrate with your current tablet, cash drawer, scanner, and receipt printer. Installation and training support is fantastic.
Square is for small businesses just getting started, processing under $10,000 per month. Because Square aggregates all merchants into one account, individual merchants have no monthly reconciliation reports. Customer service and support are limited.