What would you prefer: a book with mixed tactical patterns or several books about 1 specific tactic?

Hi! I would like to prepare some tactical books. What would you prefer?

1 book mixing several tactical concepts, let's say 5 concepts (like double attack, pins, deflection...) with 100 exercises per topic (total 500 exercises) or 5 books of 1 tactical concept with 500 exercises with different levels from beginner to advanced level (total 2500 exercises)?

In the first case, you only buy 1 book but you've got fewer exercises per concept. In the second case, you need to invest more money but I think it's more practical and you learn more because I can structure it easier by levels.

Best regards,

Hi! Second case, 5 books of 1 tactical concept. That would help to improve much more!