U should check mean of each method on the given problem. Which method gives better results. Similarly if u want to check rate of Convergence. Then you find standard deviation.
Follow my research. U understand all parts of methods like accuracy, stability, reliability, rate of Convergence.
I recommend you (of course )my method called RDM fuzzy arithmetic. Important: fuzzy solution of an equation consists of point (crisp) sub-solutions corresponding to crisp values of possible inputs.. This way you can check which method gives more precise and which less precise solutions. Accuraccy of fuzzy calculations can be verified and paricular methods can be compared.