Neither. Every cycle is relative to your chart. A Fire cycle that warms a cold chart is a blessing. The same Fire cycle hitting an already overheated chart brings burnout.
Even "good" cycles bring challenges. A Useful God cycle opens doors — but walking through them still requires courage. A Wealth cycle brings money — and the responsibility and decisions that come with it.
And "bad" cycles bring gifts. A pressure-heavy 7 Killings cycle forges resilience. A quiet Resource cycle grants wisdom. Many people look back and realize their hardest decade built the foundation for their best decade.
BaZi doesn't label cycles as good or bad. It says: here is the energy arriving — how will you dance with it?