Hello @ConnerA1 ,
We cannot recommend one over another so it’s hard to say which one of the CRM integration options would be the best out of all of them. It really comes down to personal preference and your business needs on which one you choose to go with. Your 493 choices (at the time of writing this response) can be found within the integrations tab within the main navigation bar at the top the screen. Once you are in the integrations tab, CRM is a ‘filter by category’ option for you. From there you can take your pick as all of them listed are able to connect to you Constant Contact account.
Also please be advised that if you have any issues that arise from getting your selected CRM connected you will need to contact that third-party developer to troubleshoot. Constant Contact employees are not trained on third-party integrations.