See it's always nice to support diversity in the market and all that, giving some work to the little guy makes some people feel special. But when it comes down to it, the people with the better product (in this case Qualcomm) is going to be the person that gets all the work from people that are strictly business.
I highly doubt mediatek and qualcomm can even come out and compare against eachother due to the amount of sales qualcomm has compared to mediatek.
You could go ahead and watch this video which explains everything, and even shows the clear winner -
https://www.youtube.com/watch?v=w4omK5f4WU0