There is no single technology which will prevail on all grids in the future. There will be multiple generation technologies at any given time, the mix will change over time, and the specific mix will vary for specific geographies.
The following is my multi-factorial assessment as of 2016 for different forms of electrical generation. The assessment is a simple scale of 1 to 5, and is based on my judgment of each of these technologies which is informed by my background, knowledge, research, and systemic perspective. It is not a quantitative evaluation.