Use your CRM budget to make SuiteCRM work in the way you work. Don't just accept the same software that everyone else uses. Innovate. If you're not paying for licenses, pay for value.
You are limited only by your imagination. Innovate to get software that make you different. Don't pay license costs for software that makes you the same.
Software frequently needs to be customised to suit specific needs. With open source software, an open market results in increased competition and lower costs for product customisation.
And if you need quality assurance, there are many excellent SuiteCRM partners who will make customisations to your instance of SuiteCRM.
Study after study extols the virtues of open source as being more secure because of its open nature. The SuiteCRM security model gives users access only to the information they need to carry out their jobs. With SuiteCRM you can enforce granular controls over access to data and functions.
Enjoy the benefits of using inherently more secure software.