Obviously your company is the best. You work there, you helped build it, everything it does makes sense to you, you have been involved from the start. So that means your company doesn't do anything wrong, and it always does the best it can do under the given circumstances. Everyone should use you! But the problem with truly believing that you are the best is that it leaves very little room to innovate and change. After all, the only reason to ever change is to be the best but you are already there so...
Being humble is the best response to a fast-changing and competitive marketplace. The humble company understands that it needs to re-earn attention, re-earn loyalty and reconnect with its clients as if every day is the very first day.