Since both are an EDR solution, I would suggest analyzing which provides end to end mitigation. I know CB has 3 modules for the detailed analysis but not sure on the CrowdStrike.
Yes as mentioned above,DD about the environment is mandatory only based on that we can propose a solution. However just FYI, Symantec is Leader in Magic Quadrant for 2018 & for past few years. You can get the Gartner report for Endpoint Security.