Recruitment agencies and in-house teams each have advantages when sourcing candidates for companies. Agencies have extensive networks and experience recruiting for specialized roles, while in-house teams are less costly and can mobilize candidates faster. The best approach uses a combination of both - agencies help with difficult roles or large hiring needs, while in-house teams focus on internal candidates and take over once an agency identifies someone. Building strong relationships between recruiters and agencies leads to understanding client needs and supplying qualified candidates efficiently. However, attracting top talent remains a challenge.