Speed and consistency
Automated systems can react quickly and apply the same rules repeatedly. Manual traders may be slower but can interpret unusual events that fall outside a model's assumptions.
Emotion
Automation can reduce hesitation, revenge trading and inconsistent execution. It cannot remove poor strategy design or excessive risk.
Flexibility
A discretionary trader can decide that market conditions are abnormal and stand aside. A bot needs explicit rules, filters or intervention logic to do the same.
Monitoring
Automated does not mean unattended forever. Software, broker connections, VPS infrastructure and strategy behaviour still need monitoring.
Skill requirements
Manual trading demands decision-making skill in real time. Automated trading shifts more of the work toward selecting, testing and supervising the system.
Which is better?
The better method depends on the user's skill, time and ability to evaluate risk. A weak automated strategy does not become superior simply because it removes human emotion.