Which one is more important? The customer/client or employees?

Here's an "important" thought. It really depends on how you define "important"! "Important" can be defined as something of great consequence. Quite frankly, if you don't have clients/customers, you'll be out of business a lot faster than if you don't have employees and you do it all yourself. That's pretty consequential. However, "important" can also be defined as prominent or of considerable influence. You really can't run a great business without influential employees. You might be able to get by if you have a great product that everyone wants and your clients/customers aren't very influential. So it all depends on how you define "important"!