Hi maund2001,
Thanks for reaching out to Community! Ensuring that you're making the right choice when selecting the best CRM software that integrates with QuickBooks Online, may take a little footwork. I recommend reviewing your options in the QuickBooks Apps store to find the one that best suits your business needs. You can use the search engine to narrow your options, then click on the tile of your preference to locate the contact information needed for any questions about the app.
I hope this has been helpful. Take care and enjoy the rest of your day!