With one year of flyer talk experience, you should know that someone can not answere your question just like this. There are many components, and actually, it might be possible that one of the airlines would actually suit you best (whereby I doubt it.)
Where are you located,
What is your flying pattern,
What class do you travel in,
What kind of service you expect,
What kind of results you want to have,
all this could help to get you the best program.
But, actually, I think, you will stick to United Mileage Plus.