We have to try all the ways and means possible to get the best result possible for us. Generally, we need not think of others and their methods. Individuals will select their own ways based on their skills and opportunities. As long as they are not unethical we need not worry about that. Instead of concentrating on our own work and progress, thinking of spoiling the chances of others is never a good trait. How we try our best, the other person will also try his best. Finally deserved only win. So it is always advisable to concentrate on our own efforts and see that we will be on our top always.
On the other hand when we say that we would do it in the best possible way then it clearly means that we are sure of doing it in the correct way and success is going to follow. So the confidence is more in such cases and it also shows that earlier experience might also be there with the person who is now going to do that job.
Knowledge is power.
Both might have different identities though but at the end of the day both of them are so much intertwined each other that they can't be separated.
One who wants to succeed is required to do one's best else way of success becomes tough to go through. Being practical instead of theoretical brighten the chances of success.