Both the Newtonian and Einsteinian theories were able to solve many puzzles of the times. Newton was more cautious in proposing theories and worked ahead with research programs, and Einstein was more imaginative (more revolutionary), however both are great! However, both of them knew that their theories were never true, just were better and better over time. In this sense, Einsteinian theories were somewhere nearer to the truth. He was in fact on the advantage as he knew many problems that were unsolved by Newtonian and other theories. thing common to both of them is that their sources of deductions of theories were pure mathematics and logic, not their observations. Here what Einstein says about mathematics: "As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." Albert Einstein ( Jan 27, 1921) We know that mathematical laws can be proved (so are certain), so they are not real. what i think is that choosing one is just a mistake unless you use a fair coin to select one of them randomly. However, it is amazing to know that Einstein conjectured that light should bend near the heavy bodies such as the Sun. How his mathematics and logic helped him to reach this conclusion is a puzzle, as neither he nor any scientists of the time observed that phenomenon before his implication. it's 50-50.