What is the most difficult part about managing a restaurant: dealing with staff or customers?

If you want satisfied customers start by having satisfied staff.
The rest will solve itself.

Really Nice Question , Thnx Roba , I Thing That The Customer Is easy To Manage His Anger By Helping Him , But The Staff Is Always There 8 Hours Daily With Shifts Or Without , With Their Problem Out Side And Their Between each other This is harder to manage and make them all satisfied Some times You Will Make Some One Of Them Work With That Feeling my manager don't Care !

Definitely staff.
If your staff don't have clear understanding of what is expected of them you have a problem.
Second most important thing is training, if they don't know what their roles are, then you have a problem.
One can keep the customers happy by having excellent staff.

MANAGING CUSTOMERS

Manager is as strong as your weakest staff member.
The more time control, training, hand on your staff they will perform and will not have time to think of other things than to word.
(Marketing will make it much better and keep your staff fit and on standard).
I think customers can be more difficult than your staff because people have some difficult days and then like to complaint about the smallest thing specially when they going trough divorce, financial issues, relationship issues.
So customers are very difficult but also it will depends on your customer skills you've got.
When you as manager got the skills, experiance and traing/qualifications both customers and staff will be easy to handle.

I think it will how to handle any urgent happening, Also to make sure that all customers are satisfied "there's no accounting for taste meaning."

time managment ...

lool I guess, Managing Quickly the Unexpected things/problems that occur daily, might be the difficult one.

customer satifaction is our final objective, Staff is the tool or resource through which you get to the objective.
So accurate management is going hand in hand with staff and customer issues.
Sometimes both are on a balance such as when you favor one of them the other goes down.

Very remarkable, witty question! Honestly, this depends on the restaurant manager's personality type and attitude. Both can be overwhelming if the manager is incapable of dealing in a reasonable manner. If the restaurant manager is not assertive, dealing with staff members can be a hassle and a difficult task because they do not see him as an authority figure. They might disrespect him by not following protocol correctly or failing to complete mandatory tasks. If the manager is assertive and communicates well, he can maintain an organized, fully functioning team and does not have to worry too much about issues arising between employees especially if he treats them fairly. Now this assertive attitude should not be applied the same way when dealing with the customer.In my opinion, since the customer is paying for their service it's your duty to give the consumer what he demands. You should treat the customer with the utmost respect and try to understand their needs. Willing to sacrifice for the customer's satisfaction is a rule that should be standardized amongst staff members but bear in mind that these sacrifices should not involve honesty, integrity, or respect. There are moral codes that should not be broken even for customers. If I saw a customer taking advantage of a server by spewing sexually harassing remarks I would intervene, file a report, and do the professional action. And vice versa, if I saw one client being attacked or offended by a staff member I would not let it pass by. Right is right, wrong is wrong under all circumstances. An equilbrium should be maintained between customers, staff members and manager for harmony :)

Defintlay Staff Casue casue Customer Always need you for help but the Staff is your Customer and Always you serch to keep them and let them fell statsfaction