I think it really depends on your goal. Is your goal to get better at classical chess, where games often last hours? If so, then deep calculation and slow games might help. Also, it will train your patience.
However, for a casual player who often doesn't have time for slow games, fast time controls like Blitz and Rapid, or even Bullet if you can manage it, are okay.
The important thing is to analyze your games afterwards to understand where you made mistakes and what to improve.
However, for a casual player who often doesn't have time for slow games, fast time controls like Blitz and Rapid, or even Bullet if you can manage it, are okay.
The important thing is to analyze your games afterwards to understand where you made mistakes and what to improve.