This comprehensive guide evaluates seven enterprise customer service platforms across CRM-native, pure-play help desk, and conversational AI categories. The article examines how organizations with 100+ agents can measure omnichannel routing, AI automation depth, and compliance infrastructure to select the right platform. A key takeaway is that agentic AI will resolve 80% of common customer service issues by 2029, making the distinction between AI-assisted, AI-augmented, and agentic capabilities a strategic business decision rather than just a feature comparison.