I find that using Decimals is obviously easier because all you have to do is type two numbers into a calculator, but I prefer using fractions because I really like showing my work and if you get the answer wrong, you can always look back and see what mistake you made, but for the decimals you can’t see what you did wrong if you typed it in the calculators, but it’s useful for when you can’t calculate the equation in your head or on paper and I think by finding equivalent fractions is more “efficient.”