Trisotech is the standards purist of the BPM world. If you need BPMN, DMN, and CMMN all working together in one platform with proper standards compliance, Trisotech is one of the few vendors that does this well. The tradeoff is a smaller community and less market presence than the big enterprise players.
Answer 5 quick questions about what you need to do, your team and your budget, and see which tools match.