According to my experience, Honda's spare parts are relatively more expensive than Toyota's but Honda's parts are more reliable and are long lasting.
Regarding the company's service, Honda's dealer is one of the best in Qatar; you dont have to wait very long as they always try to complete the work as fast as possible.
on the other hand , Toyota has many service centers in Qatar but due to the load of work and long queues you will have to wait long for the service.
So its up to you to choose the company which suits you best.