Algorithms are most commonly judged by their efficiency and the amount of computing resources they require to complete their task.
A common way to evaluate an algorithm is to look at its time complexity. This shows how the running time of the algorithm grows as the input size grows. So, you have to calculate time complexity first. Then determine which particular algorithm strategy you may apply.
Secondly you have to understand how an algorithm operate on large data inputs. So in worst-case scenario, you just find out the time complexity of the strategies.