Competition between these two is important for everyone wants high quality search services. If you have more players they will compete each other by improving their services. A single huge search engine is unhealthy for everyone and on the long term you will notice a decline in quality and this will affect the quality of your online life.
So it is a good thing that today Google has a serious competition.
I don't think Google or anyone here is arguing about competition. The key issue is that MSFT seems to be stealing search results off from Google. That's like Gartner publishing and selling material with sections taken from research from Juniper, etc.
So it is a good thing that today Google has a serious competition.